Why would you think I need to disprove any of the theists' faith-based beliefs? I'm not trying to talk them (or you) out of them, and don't mind them holding them. If you trying to get skeptics to believe the biblical story of salvation, you'll need to make a plausible argument. Then we can have a discussion.
I guess these words must have different meaning for you than me. For me, a belief is any idea I hold that I consider correct. If I believed that God existed, I would call that a belief.
If you look two posts above this to my reply to InChrist, you'll understand why I hold those opinions regarding all theists. It doesn't matter to me how certain the theist is of his belief in a deity, I reject his unevidenced claim. I understand the limits of knowledge that we are all subject to, as well as the psychological state understood as experiencing God. And I do know you to some extent. You're a human being. That fact alone means that I know much about you, just as you do me. I know you get tired. I know you get hungry. I know that you are susceptible to cognitive biases including the will to believe in a powerful father figure, because I've been there. I know that you have no more senses or faculties than I, and no access to any information not also available to me.