As a former agnostic, I can tell you that unfortunately your kindness to agnostics is unwarranted. My agnosticism was more a combination of anger toward God, and pure laziness about recognizing his existence and importance. Mathematical proof of his existence (if I could have understood it, a highly doubtful proposition) would have done no good.
At its root, agnosticism is just another belief system that you could loosely categorize as a weak religion. IMHO, of course.
As mathematicians go, I've always been partial to Blaise Pascal. He would agree with you, I think.
Let us then examine the point and say: "Either God exists, or he does not." But which of the alternatives shall we choose? Reason cannot decide anything. Infinite chaos separates us. At the far end of this infinite distance a coin is being spun which will come down heads or tails. How will you bet? Reason cannot determine how you will choose, nor can reason defend your position of choice.
This is the famous wager. No god? Nothing lost. But, if God does exist, then having the faith to believe gets you an infinite reward. Pascal chose to believe.