Ah yes, the ol' "if you don't believe in my religious book you must be spiritually dead." These kinds if insults help show why Christians are not nice people in their core, and it's exactly because of Christianity that turns people that way. 

Religion is the opiate of the masses and the way for the powerful to manipulate the masses. The most secular countries around the world are consistently happier and have the most human rights. The most religious consistently have the fewest human rights. 

Mankind had made up hundreds of gods to worship over the millennia. The only difference between you and me is that I simply believe in one less made up god than you.