There's one thing for certain: There's no evidence of intelligence creating Perry's thought processes.
If it is valid to say "Everything has a cause except God," it is more likely that everything has a cause except for the matter/energy of the universe. If God doesn't need a cause because it is infinite, it is more likely that the matter/energy of the universe has existed forever and therefore doesn't need a cause. Starting with the matter/energy being infinite, instead of God, makes fewer assumptions and causes fewer puzzles if you admit that you believe in one uncaused entity, and that entity is the universe itself or the matter/energy of said universe.
We cannot fall back on "Were you there?" because that is true no matter what you believe. There are theories about the "cause" or "start" (almost meaningless terms in the science, but important in our limited philosophies) of the singularity that contained the stuff of our universe. Regardless of whether those are sound in our minds, the default answer "God did it" is the stuff of primitive man and we need to get past that.