It depends on what God you're talking about. If you're talking about the God of the Bible, that is truly an abominable creature. As Richard Dawkins so succinctly put it in his excellent book The God Delusion:
The God of the Old Testament is arguably the most unpleasant character in all fiction: jealous and proud of it; a petty, unjust, unforgiving control-freak; a vindictive, bloodthirsty ethnic cleanser; a misogynistic, homophobic, racist, infanticidal, genocidal, filicidal, pestilential, megalomaniacal, sadomasochistic, capriciously malevolent bully.
If this being were truly real, I would have to hate it. His commands to the Jews to slaughter the Untermenschen of their Lebensraum is morally indistinguishable from Hitler's command to invade Poland for the good of the Germans.

The God of the New Testament (personified in Jesus) is just a pussy. He doesn't seem to realize that sometimes you have to fight for good, instead promoting unwavering pacifism. He acts like the moral beacon of humanity, yet none of his moral ideas are original. The Golden Rule is just common sense; pretty much everybody agrees that being nice is a good thing. He could have easily promoted feminism or the abolition of slavery or tolerance for homosexuals or democracy, but these moral ideas were way past the thinking of first century Judaea, so nothing of the sort is found in Jesus. I can't really say I hate the Jesus character of the New Testament, but I think he is rather naïve and unoriginal.

The God of the Qur'an has similar problems to the God of the Old Testament. If that God exists, and it hates women and homosexuals and non-believers with the fierceness portrayed in the Qur'an, then it is worthy of my hatred in return.

There are some religious figures that I can dig, though, even though they have been mythologized to a large extent. The Buddha, Laozi and Kongfuzi, for example, had a lot of good non-intuitive ideas that I think can really help someone lead a happier life. They're not infallible of course, but they provide a lot of constructive food for thought.
Oneironaut Reviewed by Oneironaut on . why do people hate God if they dont belive in Him it seems to me that there is a lot of anger, and misunderstanding that goes on here, God does not force Him self on any one, He gave you the freedom to belive are not belive. And the light came into the world, and this light was the life of men.. Rating: 5