The twenty-first century has brought unprecedented change to societal norms and global civilization, with few institutions left untouched. Christianity, credited with stabilizing and influencing much of the essential structure of the United States and Western civilization, is experiencing a significant decline. Despite its historical role in promoting morality, sacrifice, hard work, and ethical behavior since the first century, the basic tenets of mainstream Christianity, including those of Protestants, Evangelicals, and Catholics, have undergone a deteriorating transformation with the passing of the WWI and WWII generations. Surveys from 2020 reveal a severe erosion in fundamental beliefs, with nearly one-third of Evangelicals failing to recognize the divinity of Jesus Christ, sixty-five percent believing He was a created being, and forty-four percent of Christian respondents believing He sinned. Research also indicates that nearly fifty percent of Americans who claim to believe in God are not convinced of His existence, reflecting a shift from absolute moral truths to conditional truths and a focus on self rather than others. Among Catholics, a plurality now supports the legalization of abortion, marking a significant shift, while recent papal comments endorsing same-sex civil unions further highlight changing perspectives within the church. Secularization poses a grave danger, threatening Christianity not from external attacks but from within its own society and church. As nominal Christians increasingly abandon fundamental precepts, the modern church drifts into irrelevance, contributing to the continued disintegration of societal morality.