-snip-
Why are you blowing this completely out of proportion? You can understand him to an extent that you can answer to and not have to insult him blindly just because he doesn't want to attempt to learn. There is a difference between a mistake and just not wanting to learn something, but that isn't the argument.
In fact, this thread should be over, you answered that you'd refund it and now you're just arguing about his grammar.
I'll stay out of it though, and let you handle it. By the way, stop trying to attempt to start a religion war by saying "If god existed"