What thing is being denounced? Specifically, and exactly, what is being denounced?
Are you conflating the Bible with Christianity? The twain shall never meet.
More than half of the Bible was written and in circulation 900-1500 years before the existence of Christianity.
If you read the Bible without Christian blinders on, it is plain that the Bible condemns Christianity and all other religions as idolatry. Rather the Bible authors call men to worship God in spirit and truth without regard to a priesthood or place.
This dramatization shows a recorded event from the Bible demonstrating what Jesus taught about the end of religion: