Who's "telling them you hate them" anyway? Personally, I can think of exactly three people I actually hate; to the best of my knowledge none of them post here (and in fact one of them I hope is dead). I find theists by turns funny, silly, bewildering, annoying, and peculiar - but hate them? Not unless they do something hateful in addition to their being a theist.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'