why does the bible,quran and torah all convey the same message?

all three of these books condone slavery. so why did these books fail to say slavery is wrong? ''if slavery isn't wrong then nothing is wrong''. and before someone says that those were different times, please! think about what you are saying, if a book has outdated instructions then the book itself is out dated. the prophets should should lead by example and not follow the evil customs of the pagans.so how many believe the gods were wrong for allowing slavery?
Mrs; why don't you want to learn about the gods. history has recorded 2,464 of them.
Maisie; Sudra 70 ;29-30 and those who guard their Chasity [private parts from illegal sexual acts] except with your wives, your slave girls and the captives your right hand possess. Sudra 4:24 all married women are forbidden unto you except your wives, your slave girls and the captives your right hand possesses. it is a decree from Allah for you. so tell me more Maisie.
rye; tell us how times slave girls is mentioned in the Qumran.

they don't, Jesus is all about forgiveness and love, Allah and mo hammed are evil warlords who married a 6 year old girl and demand world conquer, that's not love, that's hatred. Islam is false

They may all "convey the same message", but it has nothing to do with slavery, my friend.

In another word. I think manumission came after it. Abolishing slavery is not by punishing. Forgiving is better. Allah is Most Merciful and Oft-Forgiving. By this word, mankind should quickly repent.

They don't all contain the same message - not by a long shot.

The Bible also says multiple other things like one cannot shave, wear gold or pearls, eat shellfish, women should be subordinate to men, wear clothing of mixed fabrics, etc. and in that same section it says homosexuality is wrong.

However, I know MANY Christians who do all of the above things (women who have higher pay checks than their husbands for an example breaking that law) but still say that homosexuals are going to hell. At that point, they're not doing anything wrong in comparison with the Christians who do so

My point is that they will twist anything to conform to what they want it to be ~