I think Christians would have to concede that God is non-limited; a non-random universal variable which transcends all time/space and is the first cause of all things.
This arises several problems for the theist:
1) God, being the Supreme Being, can not hold faith in another divine being above him. Despite the command that we must have faith to get into heaven, and the presumption that we are created in his image (therefore should attempt to act like him in all ways), God himself must be faithless. If not, the whole concept of God itself is eroded- we are left with an infinite regression of Gods, all with higher authority over each other.
2) The only conclusion then, is that God must be an atheist. We could presumptuously say that he believes in himself- but this is an illogical conclusion, as all self-aware beings must of necessity believe in themselves. Therefore, God is an atheist and by the theists own definition should not belong in heaven.
To summarise:
1. A “god” is defined as a transcendent Creator being.
2. If it is rational, God himself disbelieves in the existence of a god (i.e. a transcendent Creator being). (from 1)
3. Either :
a. God is irrational.
b. God is an atheist. (from 2)
4. If one knows that God exists, then one should strive to be like God.
5. If one knows that God exists, then it would be irrational for one not to believe in it.
6. If one knows that God exists, then one should strive to be an atheist (from 3b, 4 & 5)
God must be an atheist, at least by default, if not intention. It seems a ludicrous thought at first- but following this line of logic, any theist striving to be like God, should in fact strive for atheism.
Given that we are all born atheists, perhaps the greatest struggle throughout life, the deepest "crisis of faith" is that in following our reasoning- staying on our path of atheism, which is fulfilling/maintaining nature's purpose. Nature has equipped us with non-belief, don't lose it!
The Argument From Divine Atheism