Simply said no particle of mass/energy can have an absolutely determinable full set of properties.
To measure/interact with anything means to change it. You don't even need to conciously do this, to touch anything is to iteract thus change it and quantum physics shows that even thinking of something may influence it in unpredictable ways.
So how does that prove that no "universally all knowing and powerfull" god may exist?
Well by the very definition of the "Uncertainty principle" you cannot know everything thus you cannot predict everything you cannot controll everything at all times
thus "allpowerful" and "allknowing" go out the window at the very start.
Say a "god" would be somehow outside our space-time continuum.. well if "he" wanted to interact/change anything here "he" would have to incarnate into this Reality
thus constraining him self to all the rules it is governed with thus again "allmighty" goes out the window, if he did incarnate here he would probably not be able to controll the information transfer fully thus even forgeting who he is and what he wanted in the 1st place.
There is no way for a directed concious interaction of some outside being aka. "god" into any local reality that would allow him to play out his "godly" powers to full extent without either completely shattering the reality or simply "playing by the rules"
thus making him just a powerful entity within the confines of any particular reality.
The very nature of how reality(and I mean any reality) can exist precludes any outside intervention without shattering said reality.