By giving 'god' omnipotent powers, knows everything in the universe, etc., it sets up a series of unsupportable suppositions:
One: Suppose you say god knows the acts, aspirations, crimes, good deeds, etc., of every person on earth and presumably every other sentient being in the universe, then the 'mind' of this god would have to reside outside of time and be unable to partake in the passage of time as we know it. This god would be like a movie editor looking at a movie frame by frame, the movie being the universe of course and each frame, the smallest time duration that can be, maybe what we know as plank's time, something like 10E minus 35 second being one frame, so this god would know what happens to every wavelength of energy, every particle, every gravitaional wave, etc., and the motions of all that from frame to frame from the birth of time to the end of the universe (thats only assuming the one universe we can see, it would have to include ALL possible universes if in fact there are multiple universes) So by this supposition, god knows at once from the beginning of the universe, 14.7 billion years ago or 6000 years ago, take your pick, it knows already who is going to fuk whom and who is going to steal from whomever, etc., and all the 'good' deeds by everyone. Knows all that stuff when the universe gets born. So that alone throws out free will, everything that will ever happen is already known by this 'god'. So using phrases like "god WILL judge you" is utter crap because the judging was done when the universe was born.
This god, assuming there is, as christians say, a heaven and hell, doesn't need to judge anyone at the end of time as christians are wont to say, we are in the ending days, blah blah blah, because this god already knew before the earth was even a pile of rocks just smashed together.
So on to point # 2:
Having said that, it would appear to me IMNSHO that this god would be the equivalent of a 5th dimensional statue, unable to participate in our time frame and so would have to have agents in our universe to be sent to what it thinks are critical times on earth. But if it knew the criticality of times, then it would not need to send an agent to 'warn' people about whatever, just send one person or whatever to the exact critical path needing adjustment and tweeking one thing, maybe an evil genius being born and a deft hand in the job to prevent it. So that would set up stories of Christ, Buhdda, etc. But there would be no need for such a thing because it could be arranged thousands of years in advance if thats what it wanted. You can't have both omnipotency and beings involved in our time frame simultaneously. Either its omnipotent or its part of our duration and therefore limited but not both.