I'm an anti-theist, not an a-theist. The difference being that I don't really care whether God exists (whichever one you pick), but I find God (whichever one you pick) to be an objectionable asshole. He (she, it, them, etc.) appears to have created a universe and accompanying plants and animals that live in a state of continuous fear, filth and danger. Who designs life-forms which can only exist by killing and eating each other? Who designs an excretory system? Why not magic the poop away? Who places the lifeforms on a planet with volcanoes, floods, earthquakes, tornados, meteors and pandemics? Who makes beings with diverse and exotic desires then forbids the realization of most of them? Who lets his own creations war against each other? Lets them torture or enslave each other? Lets them live in poverty? Who designed, for ****'s sake, the tapeworm?
Two answers are usually given:
1. It's all part of God's great plan. Well, it isn't great. It's stupid. Not only stupid, it's at times downright mean. And who makes a plan, expecting everyone else to go along with it, but fails to explain any part of it or its purpose? Sucky plan.
2. God set it all up, but it's we who messed up things using 'free will'. Ah, ok. So if I put fifty toddlers in a room along with a single ice-cream and a load of knives, it's not my fault when things turn ugly.
Sorry, God. Even if you turn up tomorrow, floating in the sky above us all and surrounded by angelic hosts don't expect me to get on my knees and grovel. Expect me to hold you to account, you wanker.