The problem is that that doesn't explain ANYTHING.
You might as well say that the only explanation for anything and everything is the Great JuJu in the Sky.
The way you insert God into this process is only as a placeholder; the same place where scientists say "I don't know". That's why you're actually exhibiting the God of the Gaps argument right now.
Saying that God created the Bubonic Plague doesn't help you cure it.
Saying that God created Dark Matter doesn't help explain what it is or how it functions.
No scientists has ever contributed to science or mankind by saying "God did it". It's a meaningless statement.
The only way to get to “God’s existence doesn’t explain anything,” or to say that “God did it” is a meaningless statement is first to accept the assertion that God doesn’t exist.
Because if God does exist, then he is the explanation for everything and all meaning comes from him.
But your premise that God doesn’t exist pretends to be an priori statement. This is an error—and it’s where your entire argument breaks down—because the statement doesn’t meet criteria for being a priori.