God literally created time and space. There was no “beginning” before the beginning because before the beginning there was no time. As our universe expands, so does the boundaries of the space-time continuum. God created it. Therefore, he does not have to exist within it.
And therefore, because he created time itself and space itself, he is omnipotent and omnipresent because he is capable of being everywhere all the time.
Also, people who discount the existence of angels have never considered the concept of extradimensional planes of existence on which other beings may exist and be capable of some level of interaction with this one.
Apparently, you take everything literally as undeniable facts that must be read in the first degree without thinking nor smiling: the Bible as much as Frink’s posts …