Say the atheist never instigated the argument; say it was the religious person who said something like, “Granny’s in heaven now but you won’t get to go there when you die because you’re an atheist.” Would a polite atheist just nod and say, “Yeah, sure, whatever,” and walk away? Would a dedicated atheist launch into an angry tirade about how the Christian heaven and hell concepts were invented by the Greeks and the Romans used these myths when they invented Christianity because they learned religion was better than warfare for conquering nations?