None of it.
And none of it is actually wrong or bad, either. That's the thing.
Now, there are things I think are bad - murder, theft, etc. Things that do actual harm to other human beings.
If religion restricted itself to that alone, I probably wouldn't have as much of a problem with it.
But religion is about "control", not morality.
Whether it be not eating meat on a Friday during Lent or making some woman wear a burkha, ("stop showing that ankle, you slut!") or making everyone show up at a house of worship once a week to grovel in front of the imaginary sky man, most of what you call "holy" is about control.
And trying to ban behavior you don't like is, too.
I would never have an abortion, or get a gay marriage, and porn frankly bores me. But I wouldn't tell anyone that they couldn't indulge in those things, because it isn't any of my business.