Your argument is that Atheists claim the universe is an effect without a cause since they don't believe in God and don't say what created the universe.
The truth is that science has not yet explained what caused the "big bang" but they do not claim it is without cause.
On the other hand, your God is an effect without a cause by your own admission.
When you realize why you reject the existence of all other gods, you will understand why I reject yours. All religion is myth and superstition.