The Bible is an extensive record of about two thousand years of religious history, from Abraham to the life of the last Apostle, John, plus highlights of the time going back to Adam. One approach to comprehending all the changes that occurred over that period is called Dispensationalism. Dispensational doctrinal systems attempt to answer the question: If God is unchanging, then why do some ancient laws and customs that He laid down for people (such as the Jews) to follow endure while others have been replaced or modified? According to the various dispensational views, you have this view of the development and change of religion over time:
1) Some changes are due to cultural drift, invasion (by Assyria, Babylon), syncretism with neighboring peoples (like the Canaanites), corrupt kings (most of them!) or the influence of false prophets (like the Baal worshipers that Elijah fought). The Bible shows how these practices were forcefully opposed and ultimately rejected.
2) Some changes are due to additional revelation from God. These changes are remarkably consistent with what was revealed before.
3) Some changes introduce a New Covenant or a dramatic change in the mode of worship, such as with Noah, Moses, David, and Jesus. The important thing here is that such changes are foreshadowed by the prophets. As it says in Amos 3:7, “Truly the Lord GOD will do nothing he has mentioned without revealing his purposes to his servants the prophets." The reliability and great number of fulfilled prophecies is what set Judaism and Christianity apart from other religions.
So I would say that Christianity stands apart from other changeable human religions in that its changes were planned by God and announced in advance, while still preserving much continuity. For example, if I read about the ethics practiced by Job, a man who lived almost 4,000 years ago, I see nothing objectionable or foreign or outdated in his beliefs. Indeed, Job, a Gentile, prophesies the creation of an authoritative book collecting God's oracles to man, he prophesies Jesus walking on water, refers to his savior as the "Son of Man", lists dozens of other historical events later found in the Bible, and even describes the beasts that figure prominently in the Book of Revelation.
Christianity is not like religions of human origin. As it says in 1 Thessalonians:
And we also thank God continually because, when you received the word
of God, which you heard from us, you accepted it not as a human word,
but as it actually is, the word of God, which is indeed at work in you