How can people say The Bible is a sound moral doctrine when it includes both moral and immoral verses?

It very plainly says that being gay is an abomination (ok many people still believe this) but it also explicitly condones murder, rape and slavery. One verse even says that a man without testicles or who has had them crushed cannot be granted entrance into heaven? Please take some time to think about objective morality and by all means look up the verses (I'm sorry I can't quote them for you but i have read them) before you comment.