I'm an atheist and I'm proud of it, because...

... I overcame a quiet important part of my upraising, not out of being rebellious, but because it didn't make sense to me anymore.
... I find hope and joy in a life, that has no purpose besides the one I give to it.
... I'm not dependend on an ideology, which is over two thousand years old and definetely needs revising.

Needless to say, at times I'm envious of the easy strength and feeling of community people find in their beliefs, but I will never envy narrowmindedness and exclusion of people, who doesn't share my belief-system.

So, be happy, in your own way and let others do the same, in their own way.