Why does God not like gay people?

So in the bible it God says that gayness is a sin.........So is being gay a sin or is only engaging in a act a sin? What exactly does it say in the bible about this? Does Judaism say gayness is a sin as well? What about Islam? Would God believe gayness you are born with or is it a choice? Also, someone told me that maybe people later put inthe part about gay people and God didnt say it could that be true? How do we even know that the bible is the exact word of God?????? It is 2000 years old couldn't it get messed up or lost in translation by then?