Limits to Omnipotence

I recently mentioned in a paper I wrote that my personal understanding of God does not require Him to be omnipotent. In fact, I'm not sure He can be. Consider the Euthyphro Problem. Euthyphro once asked another philosopher (Socrates, I think) whether moral acts were moral because God commands us to do them or whether God commands us to do those acts because they are moral. My answer to that question is the latter. I believe that there are universal moral laws whose existence predate the Godhood of God. I do not believe that God can change those laws or break them without consequences. This means that there is at least one thing that God cannot do. Hence, He is not truly omnipotent.

I also have problems with omnipotence in general. There are dozens of paradoxes that illustrate the problems that omnipotence can encounter. For example, could an omnipotent being create a rock so heavy that that being couldn't move it? One's first thought might be "no, because an omnipotent being could move a rock of any weight," but that would mean that there is at least one thing that that omnipotent being could not do: create an immovably heavy rock. Omnipotence seems to be impossible.

I acknowledge that God is very powerful. I might even be able to acknowledge that "He has all power in heaven and in earth," as we sometimes read in scripture, as long as that doesn't imply that He has the power to override the universal laws that go beyond this heaven and this earth. He certainly seems to be powerful enough to consider Him omnipotent for all reasonable intents and purposes. Yet, I don't think that God is truly omnipotent, and I'm not altogether certain that true omnipotence can even exist.