In the Christian era, the Sabbath has been a point of contention since at least the fourth century AD, when the Roman Catholic Church claimed the authority to shift the day of worship from the seventh day to the first. Over the subsequent years, countless seventh-day Sabbath-keepers faced imprisonment or death for adhering to the fourth commandment. During the Protestant Reformation, those who opposed the Catholic Church's abuses broke away, yet they retained the altered Sabbath tradition. Today, most professing Christians observe the first day as the proper day of worship, despite the clear biblical affirmation that only the seventh day was blessed, sanctified, and made holy. Catholic theologians openly acknowledge this change, asserting that church leadership holds the authority to make such modifications, even though the Bible upholds the seventh day as the Sabbath. Protestants, however, justify Sunday worship as a tradition of men, claiming it honors the day of Christ's resurrection. Yet, there is no biblical evidence of God transferring the sanctification and holiness from the seventh day to another. The assertion that the Sabbath has changed implies that the Creator Himself is changeable, contradicting the truth that with God there is no variation or shadow of turning, and that Jesus Christ is the same yesterday, today, and forever. The Sabbath is not a minor detail or obsolete ritual; it is the capstone of the creation week, set apart by God as holy to allow fellowship with Him without the distraction of ordinary labors. God gives no indication that the Sabbath is temporary or subject to change, and prophecies affirm that it will be observed after Christ returns and establishes His Kingdom. Throughout Scripture, from creation through the ministry of Christ and into the New Covenant church, God's establishment and reinforcement of the seventh-day Sabbath remain steadfast, with no hint that the day of worship would shift to the first day of the week.

The change from the seventh-day Sabbath to Sunday was made by men, not God. Protestant theologians justify Sunday worship by saying it honors Christ's resurrection, yet no command, explanation, or word from an apostle or prophet establishes such a change, and it would have caused an unthinkable doctrinal firestorm in the first century. The resurrection's timing matters for a different reason: it fulfills the sign of Jonah, the one sign Jesus gave that He is the Messiah, three days and three nights in the grave (Matthew 12:38-40). The holiness of a day is nowhere in view. Those who claim a Friday crucifixion and Sunday morning resurrection cannot fit 72 hours between the two, so they undermine the very sign that proves Christ's Messiahship. Jesus was killed on Passover, a Wednesday that year, and buried before the high-day Sabbath, the first day of Unleavened Bread, began. He lay in the grave until Sabbath afternoon and rose then, on a day already holy. Even if the resurrection set the day of worship, it would still be the seventh day. Sunday-keeping is therefore a tradition of men, adopted by assumed church authority or careless handling of Scripture. Like the Pharisees, church leaders have made the commandment of God of no effect by tradition (Matthew 15:6), though Jesus and John teach that loving God means keeping His commandments (John 14:15; I John 5:2-3). When Christ returns, all who claim Him as King will again hallow the Sabbath (Isaiah 66:22-23).

Tragically, the vast majority of professing Christian churches, over 77% according to research, have chosen the venerable day of the sun as their day of rest, rejecting the day God hallowed from Creation. Most professing Sabbatarians, a mere 5% of the total, have also discarded the annual Sabbaths and holy days identified in Leviticus 23, which outline God's master plan for the future. The Eastern Orthodox Church, the Roman Catholic Church, and its multiple Protestant daughters have all rejected the day God sanctified as the Sabbath, embracing instead the day faithfully worshipped by pagan cultures across history, venerating their sun gods. This rejection of the seventh-day Sabbath, the day on which Almighty God regularly instructs His chosen saints, has led to a predictable erosion of the other commandments, resulting in widespread moral decay among peoples who should have known better. Historically, human hands rather than divine authority altered the Sabbath. Early in the fourth century, Emperor Constantine, seeking political advantage, issued a civil decree on March 7, 321 AD, making Sunday a day of rest, stating that all judges, city people, and craftsmen shall rest on the venerable day of the sun. This edict marked the first law establishing Sunday as a sacred day of rest. Following Constantine's lead, the Roman papacy at the Council of Laodicea in 364 AD passed a law condemning the practice of resting on Saturday, transferring it to Sunday, declaring that Christians shall not Judaize and be idle on Saturday but shall work on that day, while honoring the Lord's day. If found Judaizing, they were to be shut out from Christ. Eusebius, a noted Roman Catholic bishop, confirmed this shift, stating that all duties of the Sabbath were transferred to the Lord's day. Thus, human intervention, not divine command, changed the day of the Sabbath, depriving the churches of the world from the knowledge of God's master plan revealed through His weekly and annual Sabbaths.

Man has often deviated from God's clear teachings, leading to divisions among religious groups. A striking example is the alteration of the Sabbath, which the Bible authorizes as Saturday for the worship of God. Despite this, the Catholic Church has established Sunday as the day of worship, claiming authority to do so, though such permission is not found in the Bible. Protestants, while agreeing that this permission is absent from Scripture, still do not observe the Sabbath as designated. This reflects man's stubborn nature, turning away from God and insisting on setting his own rules, contrary to the enduring and pure words of the Lord. God's teachings remain absolute, and He will not bend to man's will, for to do so would deny His sovereignty, character, and goodness.

The Seventh-day Adventists, adhering strictly to the Bible as their teacher, find no warrant for changing the Sabbath from the seventh day to the first. They set apart Saturday for the exclusive worship of God, following the positive command of God Himself, reiterated in the sacred books of the Old and New Testaments, and practiced by the children of Israel for thousands of years. In contrast, Protestants, since their emergence in the sixteenth century, have rejected the day named by God for His worship, assuming the first day, Sunday, in apparent contradiction to His command, without any reference to such a change in the Sacred Volume. The Adventists derive their belief from the consistent teaching of both the Old and New Testaments, confirmed by the life and practice of the Redeemer and His apostles, showing no cancellation of the Saturday arrangement. Protestants, however, have aligned with a practice not supported by their infallible guide, the Bible, adopting a day for worship that lacks Scriptural endorsement, thus teaching and practicing what may be contrary to God's explicit command to remember the Sabbath day and keep it holy.

In the fourth century the Roman Catholic Church attacked a major doctrine of the true church by emphasizing the weekly Sabbath. The issue of the Sabbath became a point of frustration to the Roman church. When the practice of keeping Saturday Sabbaths became general at the close of the fourth century and gained ground in the Eastern church a decree was passed in the Council of Laodicea that members of the church should not rest from work on the Sabbath like Jews. At the Council of Laodicea held in the year AD 364 where several hundred bishops gathered a law was passed prohibiting Christians to Judaize that is to rest from their work on Saturday as do the Jews. This law was thought necessary because of the rapid gain throughout the Eastern church of Saturday observance. Gradually the first day of the week came into prominence as an added day but later by civil and ecclesiastical authority as a required observance. The first legislation on the subject was the famous law of Constantine enacted AD 321 at the Council of Nicaea. The acts of various councils during the fourth and fifth centuries established the observance of the first day of the week by Roman Catholic authority. In the great apostasy that followed Sunday rose to prominence. During the centuries that followed however there were always witnesses for the true Sabbath although under great persecution. A rule of faith or a competent guide to heaven must be able to instruct all the truths necessary for salvation. Now the Scriptures alone do not contain all the truths which a Christian is bound to believe nor do they explicitly enjoin all the duties which he is obliged to practice. Not to mention other examples is not every Christian obliged to sanctify Sunday and to abstain on that day from unnecessary servile work. Is not the observance of this law among the most promising of our sacred duties. But you may read the Bible from Genesis to Revelation and you will not find a single line authorizing the sanctification of Sunday. The Scriptures enforce the religious observance of Saturday a day which we never sanctify. This change of the Sabbath from Saturday to Sunday by the Roman Catholic Church made the visible sign of the seventh day Sabbath an even greater witness of the identity of the true church of God. Sadly after the Council of Laodicea in the year AD 364 persecution of seventh day Sabbath keepers became much easier to carry out. There is no Scriptural support for keeping any other day than the seventh day Saturday Sabbath. To this day the Protestant church remains subservient to the Roman Catholic Church. Protestantism is the daughter of the Roman Catholic Church.

The Sabbath's standing as the day of worship is never in question in the Bible, yet man has altered it in two ways. The Catholic Church admits the day is commanded in Scripture but claims authority to change it, and Protestant churches argue around it on technical legal grounds, reducing it to something merely ceremonial. Both treat it as the least of the Ten Commandments, though Matthew 5:17-19 and James 2:8-12 show that not one jot or tittle of the Royal Law has passed away, so breaking the fourth commandment is as immoral as adultery or lying. The Pharisees changed it in the opposite direction, piling up hundreds of rules after Ezra and missing God's intent altogether. Ancient Israel generally kept the correct day on the calendar, but God rejected their Sabbaths as "your" Sabbaths because of how they kept them (Isaiah 1; Amos 5; Ezekiel 20). Their hearts followed idols, and they profaned the day by treating it as common, even blending idol worship with temple services on it. Keeping the right day is therefore not enough. The Sabbath is a sign of the covenant relationship with God, a weekly appointment to know Him, and its real keeping is measured by attention to Him rather than by ceremony or human rules.

The seventh-day Sabbath, established in the fourth commandment, was displaced by human decree rather than divine authority, and this alteration is presented as intimately connected to the rise of the Trinity doctrine. The claim is made that the Trinity heresy would never have gained a foothold within the church if the apostolic body had continued honoring the seventh-day Sabbath rather than allowing it to be replaced by "the venerable day of the Sun." This substitution is attributed directly to Emperor Constantine and his sycophantic prelate, Bishop Eusebius, who on March 7, 321 AD issued a decree making Sunday the official day of rest and worship—decades before the Trinity itself was formally adopted at the Council of Constantinople in 381 AD. The same historical figures responsible for abandoning the Sabbath are identified as the architects who "forcefully ramrodded through" the Trinity doctrine, revealing a shared pattern of departure from biblical instruction in favor of pagan-influenced innovation. Constantine's own religious character is scrutinized as evidence of this compromise. Historian Paul Johnson's assessment is cited to show that Constantine "appears to have been a sun-worshiper," a member of pagan cults sharing common observances with Christianity, and that his conversion was no sudden, genuine transformation. Even after professing Christianity, Constantine built a triumphal arch to the sun god and erected a statue of that same deity bearing his own features in Constantinople. Johnson's further description of Constantine as a man whose "private life became monstrous as he aged" and who mastered "the smoothly worded compromise" underscores the moral unsuitability of such a figure to be shaping Christian doctrine—including the decision to shift the day of worship from the seventh day to Sunday. The rhetorical question is posed: how could a non-repentant murderer and manipulative politician be entrusted with setting Christian doctrine, yet this is precisely what happened when the Nicene Creed's teachings, including the abandonment of the Sabbath, were accepted. This change of the Sabbath is framed as part of a broader pattern in which the "greater church of God" and its various splinter groups have resisted the "antinomian Kool-Aid" that led the majority of professing Christians—now numbering in the billions—to accept both Sunday worship and the Trinity doctrine simultaneously. The two errors are portrayed as historically and theologically intertwined, both introduced by the same ecclesiastical and political authorities in the fourth century, and both representing a departure from the practice of the apostolic church and from the plain teaching of Scripture. Just as the Trinity cannot be found in the Bible despite being called the cornerstone of Christian doctrine, the shift to Sunday worship likewise lacks scriptural warrant, having been imposed by imperial and ecclesiastical decree rather than divine command.

The Bible nowhere authorizes the change of the Sabbath from the seventh day to the first. The early Christians kept the seventh day, and only decades after the apostles' death did a politico-religious system repudiate the Sabbath of Scripture and substitute Sunday. Roman Catholic authorities freely confess that the Church made this change on her own authority, not Christ's. Cardinal Gibbons states that one can read the Bible from Genesis to Revelation without finding a line authorizing Sunday sanctification, that the Scriptures enforce Saturday, and that the Church, not Christ, changed the day. Catholic writers cite the change as proof of the Church's power to institute holy days, and they say Protestants, who profess the Bible alone as their rule, contradict themselves by keeping Sunday. Protestant scholars from Anglican, Baptist, Congregationalist, Disciples, Lutheran, Methodist, and Presbyterian traditions agree. They admit that no New Testament text commands Sunday observance or records a transfer of the Sabbath. Jesus never hinted at such a change, and Sunday is never called the Sabbath in Scripture. They say Sunday rests on church ordinance and custom, and some note its pagan, sun-god associations. Alexander Campbell holds that the Sabbath never was changed. Others, such as Wesley, Moody, and Blake, hold that the Ten Commandments, the fourth included, remain binding, since the moral law was never repealed.