Suppose we observe an event E in the universe. A theist says that God explains this event E. An atheist then makes the following argument: “whatever you posit God as an explanation for, I can posit an alternative explanation with simpler attributes than God.”
Now of course, theists will say that nothing can be simpler than God. But let’s, for argument’s sake, say that this is false. Let’s say that God is necessarily more complex than whatever it purports to explain. For example, let’s assume that the universe is more simple than God.
Now, let’s go back to an event E. Either that event E is necessary or contingent. If that event E is necessary because of God, the atheist can say that this event E is necessary because of some law of nature that we haven’t figured out yet that is impersonal. If the event E is contingent because of God (say, by God’s free will), then the atheist can simply say that the event E was a brute contingent fact (I.e. the chances just played out that way through some natural mechanism such as quantum mechanics and the rest of physics).
Let’s now suppose the event E is the beginning of the universe. The theist might posit God to explain E. But the atheist can simply posit an impersonal cause to explain E. The theist might argue that this cause cannot be a physical law and must be something else since all laws start at the beginning of the universe. But the atheist can simply assert that there’s some other mechanism by which event E arises that is impersonal but doesn’t contain the complex attributes of God such as omnipotence, omniscience, etc. After all, if a theist can posit a cause with X number of attributes to explain event E without evidence, the atheist can also posit a cause with <X number of attributes without evidence to explain the same event E.
The question then is: does this strategy work? Is there any philosophical literature behind the general notion of nature or impersonal causes explaining everything that God can but without the additional complexity? Graham Oppy talks about how naturalism and theism have the same explanatory power with the difference being that theism posits more kinds of entities. Are there any other philosophers that talk about this?