You're still implying the creator is governed by time by saying he must have a beginning. If he exists in a higher dimension then we couldn't possibly understand how time and space is not a factor just as an organism confined within 2D space could not comprehend a 3D object.
Fallacy Of Special Pleading
The extraordinary claims of such a being transcending everything would require extraordinary evidence to be considered true. There is no such evidence.
Continuum fallacy. Whether or not something is a potato is ambiguous. When does something stop being the root of the potato plant and become a potato? As others have mentioned, what about french fries or potato chips? They are both potato and not-potato. This is a problem with two-valued logic (instead of continuous-valued logics, such as fuzzy logic) in that it requires a precise predicate to render a valid conclusion. See 'Heap Paradox' on wikipedia.