What is a Buddha not?
A Buddha is not the creator of the universe, like "God" in the Christian-Judeo-Islamic sense. In fact, there is no creator of the universe given in Buddhist philosophy apart from the karma (actions) of sentient beings (beings with a mind like huans and animals).
The Buddha is not omnipotent (all-powerful) like the Christian-Judeo-Islamic "God". (The simple reason is that if he were, out of compassion, he would have long released all sentient beings from suffering.)