The above paragraph is total nonsense.  It has no meaning.  Saying "God is a paradox" is equivalent to saying "God cannot exist" and I don't think that was your intent.  In addition, claiming that infinity cannot be understood is a vague statement at best, and even if true it still wouldn't be an argument for the existence or omnipotence of a god.  Lastly, you clearly didn't understand the God/rock argument so let me try to help.  If you claim the answer is yes, then God has a limit, if the answer is no, then God also has a limit.  Therefore God, or any being for that matter, must have limits of some kind.  Saying he could choose to not be able to implies that he could choose to be capable of it, and therefore one can simply conclude that he is capable of that act.