someone tell me why?

why is it that religious people pick and choose what "sins" they want to commit? some of them say something along the lines like "u cant do that, its a sin, your going to hell" over stupid things like cursing or not going to church or no sex before marriage(which nowhere in the bible is it listed that sex before marriage is a sin), but almost all of them have been divorced, or cheated on their spouse. they believe some book (the bible) thinking its gods word, and try to follow it. if they really read it, they would know how stupid it is. for example, one passage talks about being gay, the father in the passage says he would rather give up his daughter to be basically raped, then to have his son sleep with a man. why is this?

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