While this would make your argument more consistent, it begs the question for the existence of the supernatural
definitions:
natural: That which is governed by temporal cause and effect.
Supernatural: that which is not governed by temporal cause and effect.
God: The First Cause.
Follows from the semantics:
Everything that exists naturally has a cause. ( follows from definition of natural)
The Cause of that natural thing that exists is either something natural or supernatural. (because everything can be categorized as either natural or supernatural, according to my definitions)
If any cause is natural, the cause itself, being natural, must have it's own cause. (per the definition of natural)
The cause of that cause, if natural, must have it's own cause.
The cause of that cause, if natural, must have it's own cause, etc.
It goes into infinite regress, which means either:
1) At some point, something supernatural, that is something that has no cause, exists at the start of the chain. Call it the first cause.
2) It is possible to have an infinite length chain of causes causing other things, with no first cause. This means that everytime you learn the answer to "Why" you'll simply get an answer that raises at least one other question, and there are an infinite number of causes.
So either there was a supernatural first cause, or the universe was caused by an infinite number of causes in a chain.
anyways....