If god granted us free will, and if we commit evil by our free will, then by the regression that you use so often to assert that god created us, I can argue that god is responsible for evil.
If my child becomes a mass murderer, then it is gods fault. He created him afterall. Everything happens because god wills it.
Appealing to the supernatural is just intellectual laziness. "I can't think of an answer to this question. Therefore, god did it".
Cool. So there has to be another god that created this god. If you choose to dishonestly end this regression at your god, then you're committing a fallacy of special pleading.