Why Does God Need A Creator?

[Question Mark]

if god did X, then he is Y, which means he can do X.

If God could do X, then God has to be Y.

We can't say what he's done without first understanding what he's capable of.

Then how do you tell if God is Y, or if he can do X? What have you seen, heard, or otherwise experienced that has led you to the knowledge of anything in regards to what god is, or what he can do?

And how do you justify that if god could create the universe, then he has to be the creator? We don't know that, do we? Not everyone who can do something, does do that thing.