I don't know what ``God'''s exact definition is, what features and properties it's supposed to have. Without a definition, I can't really talk about the concept (as it's not a percept, it must be an abstract concept, or something which does not interact with me in any way that I can perceive). With clear definitions, I can answer the question in a variety of ways (usually an uncertain truth value ranging from 0.0 to 1.0). Without clear definitions, I'm forced to treat it as a subjective word and intuit a meaning derived from other people's expectations: one thing that's interesting is that most people tend to think the word represents something objective and immutable, yet everyone has a different concept of it, which contradicts the initial assumptions.
However, I can tell you this: I do have a worldview which does not hold impossible feats of physical omnipotence (merely grants our world an astonomically low probability of being one where this is possible, for example living in a simulation and the one doing the simulation feels like messing around). I do hold logical omnipotence impossible (undefining/changing unchangable states or making an unchangable mathematical truth within some structure/system untrue). To put it simpler, by popular definitions, there is no being which cannot be given a more precise and exact definition, and once that is done, it no longer is worth of holding that title.