Hehe. You have listened to much to fundie literalists.
God is a message to us about why and how to live our lives. Actual events, or even a physical existence of God is irrelevant to the message. The reason for worshipping God is to live the message. So literal issues such as "omnipotence," physical existence in emotions and such are not even my concern.
Whether God build the Universe in 6 days or it came through per the Big banfg is irrelevant to the message. The bible is there for us to get the message of our lives. Jesus is the way the message is driven home (Ignoring the coup d'etas of the interloper paul who used the new religion for his own punitive, hate mongering purposes).
To me, asking if God is omnipotent enough to create the universe is as irrelevant as most of the creationists claims regarding the sciences. God is not about the physical world at all.
(So you can see why I find the fundie literalists' arguments about religion to be irrelevant and the non-Christian arguments as an argument against the literalists rather than against God. That's probably why I get so well along with Atheists a.o.
Most of the time, I agree with them )