The anger passes as you continue to explore and expand your world view. For me it took about 6 weeks from when I admitted to myself I no longer believed to when I stopped being angry. (I am likely an exception as I just hate feeling angry. It angers me to feel angry :P)
I do still have some resentment. But that's different than anger.
Meditation has helped. Not the weird, transcendantal, metaphysical kind of meditation. Just finding a quiet place, being alone with my thoughts and focusing on nothing but enjoying each breath even for as little as 15 minutes a day has helped ease the anger and resentment.
I actually feel more of a pity now for those that still believe. It's a sad sad thing to see people waste their lives trying to please a made up thing.