ID is not a theory. It is a major criticism of darwinism, and it does not require a God for there to be intelligent design. It only requires an organizing principle.
One already proposed organizing principle is natural selection. It does not answer the mail. The complexity to too great to accept natural selection as the organizing principle.
There needs to be another principle proposed that is more intentional.
And where would that "intelligent principle" [aka a deity] come from? If life on Earth is somebody's experiment in a cosmic Petri dish, the problem would merely become the natural genesis of experimenters. Reductio ad infinitum. Hierarchically working natural selection does answer the mail, at least for the purposes of work in my field [I happen to be a chemist employed in genetic engineering].