ax

I have heard many theists claim, that god is above, and bigger than anything we can concieve. And if we can concieve if god, and "he's" greater than everything, and seeing as "he" falls under the description of everything, does it not make him greater than himself? (creating a loop in the idea).
?

hmmmm

It doesn't seem so. To be greater than the greatest seems like a contradiction. God is the subject, and the things that you are claiming this subject to be greater than are the predicate (the things not greater than God and/or the greatest). But once the subject refers back to itself, it defeats the purpose for which it was stated: The subject can't refer to itself, in this case, or a contradiction will obtain. If it does refer to itself, the subject will no longer possess the same characteristics as it once had. Instead of being the greatest, it would just be great, since something in the predicate would be greater. But this just equivocates on the subject. If there is no equivocation, then there is a contradiction.