His whole life was a mess, and the family he tried to raise became a shambles. He realized that he just couldn't explain the universe, and his everyday decisions and actions and thoughts, as an atheist. He came to believe in God, as a Christian.
He told me, "everyone wants to blame evil on God, but they want to take credit for the good things." He hit it on the head. We, like Satan, can't BELIEVE the God of the universe would make so much trouble for Himself and everyone else in the way He has made things, and we think we know better, and want to take His office. That is prideful unbelief, actually, and it has its fruits, including spiritual death and the wandering for eternity with your chosen god, Self. And we can get a taste of this on earth: Self is a demon god that never stops torturing.
When we take it upon ourselves to choose our own moral axioms, we are telling God, as agrandis says, that we are smarter and better than He. You have stepped up on the God-box and announced that it's good to consign millions of unborn babies to annihilation. Stalin got up on his God-box and decided that it's good to consign millions of live people to their annihilation. It's not wise to stand on the God-box.