If a god, exists he/she/it must be greater than any human.
The definition of 'greater' could be many things, but I choose to define it in a measure of "thought-space". Thought-space would be something like what you are able to keep in your thoughts, and understand - so its so much more than IQ...
Many people state that "if I can not understand god, then I will not believe him/she/it".
But implicit in this you thereby state that you do not believe in any god, since he/she/it must be greater than you, and hence something you wont understand completely.
This also leads to the fact that paradoxes MUST exists in religion or it is not a religion involving a real god.