The New Testament tells slaves to obey their masters, and says women should remain silent and obey their husbands, and not have power over their husbands because the glory of women is childbirth.

The morality of the New Testament - the entire Bible, actually - is pretty vile by modern standards. Which is not meant to be an insult, because it was written thousands of years ago and morality necessarily evolves as societies become more complex. Expecting a modern view of gender equality or innate human equality from the time of the Roman Empire or the Bronze Age would be absurd, that just didn't exist.

But because Christians believe the Bible is the inerrant and absolute word of God, they have to justify the cognitive dissonance between modern morality and Biblical morality by pretending that either modern morality is sinful (eg accepting gays goes against God's design or a hundred years ago accepting equality between black and white people goes against God's design,) or the Bible was actually super progressive all along.

But modern morality is mostly an invention of the Enlightenment creating an alternate, secular model that even Christians eventually appropriated.