You're doing just fine. Step out of the arena for a moment and look at the game so far.
Greene is (allegedly) an atheist. He does not believe in any gods, but he does not approve of bashing religion.
Nevertheless, he bashes your religion, because he says it is not a real religion and mocks real religions.
What is the difference between your religion and the religions we allegedly mock? Nothing, apart from the alleged existence of our god. We fit all the same criteria as 'real' religions do. So the only real distinction between 'real' religions and our 'mock' religion is that apparently their god exists, but ours doesn't.
Except that Mr. Greene is allegedly an atheist, and does not believe in the existence of any gods.
My suspicion is that he is a rather poor atheist.
My suspicion is that he actually believes in god.
He is not happy about this, he is not at peace with this internal contradiction, this cognitive dissonance. So he's taking it out on you.
So how do you, as a good religious believer, want react to that? Do you want to confront him about his internal struggle? Do you want to offer him FSMism for 30 days, and if he doesn't like it he can have his atheism back? Or do you just want to love the sinner but hate the sin?
It's up to you. Consult the eight "I'd Really Rather You Didn'ts" and choose the approach you're happiest with. I think you're doing great so far. Good luck!
"I don't mean to sound bitter, cynical or cruel; but I am, so that's how it comes out." ~ Bill Hicks.
"To argue with a person who has renounced reason is like administering medicine to the dead." ~ Thomas Paine.
"One should not believe everything one reads on the internet." ~ Abraham Lincoln.
"If you're making a political point wearing a balaclava, you're a c***. It was true for the IRA and it's true now." ~ daftbeaker.