The problem of the creator of God is the controversy regarding the hypothetical cause responsible for the existence of God, presuming God exists. It contests the proposition that the universe cannot exist without a creator by asserting that the creator of the universe must have the same restrictions. This, in turn, may lead to a problem of infinite regress wherein each newly presumed creator of a creator is itself presumed to have its own creator. A common challenge to theistic propositions of a creator deity as a necessary first-cause explanation for the universe is the question: "Who created God?".
Some faith traditions have such an element as part of their doctrine. Jainism posits that the universe is eternal and has always existed. In Mormonism it is believed that the God of this Earth was once a mortal human, who had a father of his own. Ismailism rejects the idea of God as the first cause, due to the doctrine of God's incomparability and source of any existence including abstract objects.
No, don't ask that. That's what all the religions say – don't ask who created God. But this is strange – why not? If the question is valid about existence, why does it become invalid when it is applied to God? And once you ask who created God, you are falling into a regress absurdum.
John Humphreys writes:
... if someone were able to provide the explanation, we would be forced to embark upon what philosophers call an infinite regress. Having established who created God, we would then have to answer the question of who created God's creator.
In The God Book, Deist Michael Arnheim writes:
The atheist objection is that if God created the universe, who created God? Judging by the number of times that Dawkins repeats this same point in The God Delusion, one must assume that he sees this as a killer argument against the existence of God.
Alan Lurie writes:
In response to one of my blogs about God's purpose in the creation of the universe, one person wrote, "All you've done is divert the question. If God created the Universe, who created God? That is a dilemma that religious folks desperately try to avoid." The question, "Who created God?", has been pondered by theologians for millennia, and the answer is both surprisingly obvious and philosophically subtle ...
... whatever one thinks about the beginnings of the Universe, there is "something" at the very origin that was not created. This is an inescapable given a cosmic truth.
Defenders of religion have countered that the question is improper:
We ask, "If all things have a creator, then who created God?" Actually, only created things have a creator, so it's improper to lump God with his creation. God has revealed himself to us in the Bible as having always existed.
It is also argued that the question becomes irrelevant if the Universe is presumed to have circular time instead of linear time.