C. S. Lewis and Walter Block (who is an atheist) have explained how this question is sophistry, meaning it makes grammatical sense, but has no intelligible meaning. When talking about omnipotence, referencing “a rock so heavy that God cannot lift it” is nonsense just as much as referencing “a square circle”; it is not logically coherent in terms of power to think that omnipotence includes the power to do the logically impossible. So asking “Can God create a rock so heavy that even he cannot lift it?” is just as much nonsense as asking “Can God draw a square circle?”