I was a Christian for a long time. Much of my ethical sensibilities still owe a lot to Christianity, or at least the version of it which I was drawn towards. Now I'm an atheist, and I don't think it's possible to sustain a belief in an any kind of supernatural power, although there are still philosophical meanderings on the topic
that I find eloquent.
There's also many aspects of religion, especially as practiced in the US, which I think are socially problematic. The study my wife and I did of auto-biographical accounts of religious deconversion really highlighted for me how dysfunctional fundamentalist social ties can be. And politically, I tend to be opposed to the interests of conservative religious groups.
But at the same time, I think d2_e4's version of anti-theism is mostly just ignorant bigotry. Probably the best you can say for it is that he's just giving lagtight what he wants: an opportunity to feel both intellectually superior and like a suffering saint. Religion is probably the most fundamentally
human of all human phenomena. It captures both the highest heights of human experience and the awfullest evils.
Humani nihil a me alienum puto. To be so thoroughly anti-religious is basically to be a misanthrope. If you can't find any beauty or any deep questions worthy of reverence in the human religious experience than you just aren't trying at all.
The irony for me is that it always seems like the only people to have a worse understanding of religion than religious fundamentalists are atheist fundamentalists.