I think a lot of believers aren't aware of some of the vile and outrageous things in their holy books. Pro-slavery, pro-genocide, anti-women.
Men have authority over women because God has made the one superior to the other, and because they spend their wealth to maintain them. Good women are obedient. They guard their unseen parts because God has guarded them. As for those from whom you fear disobedience, admonish them and forsake them in beds apart, and beat them." Quran 4:34
[Forbidden to you are] married women, except those whom you own as slaves." Quran 4:24
If a man is caught in the act of raping a young woman who is not engaged, he must pay fifty pieces of silver to her father. Then he must marry the young woman because he violated her, and he will never be allowed to divorce her. (Deut 22:28-29)
When a man sells his daughter as a slave, she will not be freed at the end of six years as the men are. If she does not please the man who bought her, he may allow her to be bought back again.
However, you may purchase male or female slaves from among the foreigners who live among you. You may also purchase the children of such resident foreigners, including those who have been born in your land. You may treat them as your property, passing them on to your children as a permanent inheritance. You may treat your slaves like this, but the people of Israel, your relatives, must never be treated this way. (Leviticus 25:44-46)
Then there is Mohammed's rape of Aisha.