According to whom? How do you know? What's your basis? Lemme guess because someone with certain credentials that you have never met said so a long time ago or at least you read or were taught that and chose to believe it. Once again it all comes back to belief.
by the structure of our english language
Omnipotent-almighty or infinite in power, as God.
2.having very great or unlimited authority or power.
Omniscient-having complete or unlimited knowledge, awareness, or understanding; perceiving all things.
now follow me here because belief has nothing to do with this. If you are both of these and are responsible for creating life do you know what is going to happen in what ever life you create?