I am not necessarily an atheist, it depends on your definition of God. I reject all relgious conceptions of God, but accept God as a name for the mysterious source of all order, intelligence and meaning, or as existence itself.

So in this sense, God is the uncaused cause and also everything caused.

It would indeed be a counterargument if I didn't believe in uncaused cause, but I do believe in an uncaused cause, even though it isn't a seperate entity like the usual notion of God implies.