“If the Bible teaches the equality of the sexes, why has inequality always been the norm?”
This will probably come as a shock to some readers, but the Bible doesn’t teach equality, either of the sexes or of any other kind. If you doubt that, a concordance will sort you out in short order. There is a single verse in the New Testament where the word “equality” in the KJV may be construed to promote financial fairness, but the importance of strict equality of status, authority, privilege or even personhood is nowhere to be found in scripture.