Monk Of Reason
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It's a tu quoque, but I disagree. Theism is saying "we don't know everything, and we believe there is another factor" (i.e., God). We don't pretend to know everything. Every religion (and I'd say most, if not all theists) says that there is much more to God's Nature than we will ever understand.
We're not ones saying "this can't happen" and pretending we know everything about everything.
Most chrsitians seem to disagree with you on this. They "KNOW" that god loves them and that Jesus is the lord and savior. Muslims KNOW that Allah is their god. People have killed in the name of their religion in the past and caused huge amounts of animosity in the world as well as forcing religiously based bigoted laws in America right this very second. That isn't because they "think" that there is something else afoot in some kind of harmless and passive way.
Agnostic theists would be what you have described. Not Gnostic theists.
Atheism also doesn't state "this can't happen". It states "I don't believe this is happening". To doubt is inherently non-arrogant if it lacks a presumption. To have a presumption would be the definition of arrogance. As an Agnostic atheist I know I personally can be arrogant but my position as an agnostic atheist is not.