The Millennium or God's rest will be an exceedingly busy time, a time when all of humanity will be converted, a time everybody will be on the same trek.
The Sabbath is an antidote to the weariness we experience. It recalls God's pausing after completing His physical creation, focusing on the spiritual creation.
Focusing on material and temporal things undermines faith. The Sabbath is holy time, created for building faith, energizing our minds for fellowship with God.
The ancient Israelites resisted the gospel, refusing to mix it with actual obedience. What they heard never became a part of their lives; Egypt never left them.
Luke highlights Christ's willingness to give comfort and encouragement to the man dying next to Him that he would live again and be with the Son of God in Paradise.
Jesus said He would be in the grave 3 days and 3 nights after His crucifixion. Given that, could the thief have been with Christ in Paradise that very day?
Going to heaven is not scriptural. The soul is not immortal; it is equivalent to life. Mankind does not have a soul; he is a soul, subject to death.
If modern Israel disobeys the terms of the covenant, the fact that God made a covenant with them will not deflect the full impact of God's judgment.
Fully accepting God's sovereignty should drive us to seek Him so that we can come to know Him as completely as possible, which is vital to our salvation.