It looks like the discussion sort of had ended already, but people are commenting again and what I have to say seems to be different from what anyone has said!
Some people use religion as a weapon. Perhaps he's bad a negative experience like that, similar to the thread about the person afraid of hands. It doesn't make hands or religion bad, it's just that they were hurt so much by them.
I was raised by Christian Scientists, and therefore not allowed to see doctors. I believe this should be considered neglect to anyone, but considering my plethora of medical issues, this was abuse. Subsequently, I despised religion for many years. I debated angrily all the time, responded negatively to strangers trying to talk to me about it, and identified as Athiest.
But, in truth, unbeknownst to me, none of that actually had anything to do with religion. It had to do with my parents. I no longer hate religion or my parents, and I'm not Athiest.
You never know when an underlying issue of that nature is involved.
P.S. The thing that helped me most was an amazing, loving, awesome person who listened and understood and loved, and he's devoutly Christian. Even when an Athiest or anyone responds in this way, the general response of insults is probably not the best way to go. Maybe that's only how it is because he's not around, but even then, that behavior doesn't seem aligned with any religion I've encountered.