Why do assume God had a cause? If He is L'Eternal (as in the French), He has no beginning and is the uncaused cause of all things.
Again Socrates:
"But the Father and maker of all this universe is past finding out; and even if we found Him, to tell of Him to all men would be impossible."
Or to quote Lao Tzu:
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"Now everything that becomes or is created must of necessity be created by some cause, for without a cause nothing can be created."
If you are willing to say that God is uncreated (and therefore doesn't need a cause), why are you unwilling to say that reality is uncreated?
Is that logical?
If God exists because you (otherwise) don't know how the world came to be, you haven't discovered something about the world or about God. You have just given a name to your ignorance.
That is a common theory/accusation.
If you'd like to refute it, I think you have to explain why it's OK to lack any theory about how God came to be (or why he's always existed) but it's not OK to (more simply) lack a theory about how reality came to be (or why it's always existed)
When you say "reality" do you mean the universe?
I mean reality - that which exists. Nature.
I would call it God, but I believe you insist that God created Nature, so that might not make much sense for you.
I think that's just another name for the universe, and I can see why you'd want to avoid using that term, given the Big Bang and all...