I am actually not bothered by MM's belief comment at all...
why? because it actually is him admitting that he is atheist.
As you all have surely noted, a lot if not most of, theist arguments here are projections. They project how they behave onto others. So his belief that we all believe is actually an admission that he is a non-believer that refuses to admit it. You can see this line of reasoning everywhere in theist arguments. "if you dont believe in god, what do you believe in?" suggests that because they believe in something, we must too. "Without god we would have no morals" suggests that because they would behave like savages we would too. "You all have a belief in god" means that because he lies about his belief, we must be lying too.
Thank you for the admission MM, and welcome to the ranks of the non-believers!