If I'm reading you right, it seems like you're saying that God is the cause of the material universe, but that God himself is uncaused. This is the conclusion I have come to.
I guess the atheist version would be either: (1) that the material universe has always existed, which is irrational, or (2) that the material universe was somehow brought into existance, which is irrational.
If you're an atheist, it seems to me that you must accept one of these irrational premises about the existance of the material universe, and that once you have done so, your argument that a belief in God is flawed because it is irrational becomes useless hypocrisy.
I just don't see any way around this. Can any of you atheists fill me in on this?