If God, appeared in all of his power and glory, commanded anyone to do something - I doubt anyone would refuse.
I am a religious person, and I regularly attend Hindu temple services. Even then, if my god ask me to kill someone, then I'll refuse instantly. Human life is more precious than anything else in this world.
Even if he/she threaten you? Anyway, a god that needs humans to do his dirty work for him is no god.
It's right there in the bible... god does not mince words...
If a man has sexual intercourse with a male as one has sexual intercourse with a woman, the two of them have committed an abomination. They must be put to death; their blood guilt is on themselves.
Pretty straight-forward, right?
"They must be put to death"... you must murder them... will you do it?
God will not order anyone to be killed, God is powerful and strong to do everything by HIMSELF. He is a loving God and takes no delight in the destruction of People.
I've read the Bible before. So many times he asked the Israelites to go out and exterminate certain groups. He could have done it himself, but he won't.