There is no reality where you could put two things on the table and then put two more and end up with five.
Correct. That's because we live in a universe without anyone with omnipotent abilities, so the rules of reality aren't up for debate.
If you had someone like that and he couldn't warp the rules of reality and make the illogical logical, he wouldn't actually be omnipotent and would, quite literally, be the Magus without the Reality Gem.* Really powerful, to be sure, but only possessing a finite amount of power. He's 5/6th omnipotent and needs the reality warping ability to be able to multiply a finite number and get to infinity, which he doesn't have because Thanos fucked him because Thanos is awesome and better than everyone else.
When discussing beings with infinite power, the finite limitations that you're placing on their power are as relevant to the discussion as the argument as saying that stars can't generate fusion power because worms don't have feet. The limitations of completely different entities without anywhere near the power of the entity you're talking about aren't qualified as limitations of the far more powerful entity under discussion.
* If you don't get that reference, then why the hell not? The
Infinity War miniseries was put out in 1993, so you've had a couple of decades to read it and it's available for Kindle download on Amazon and is too awesome for you to have not read. It's inappropriate to have internet discussions without at least a minimal level of cultural context to go along them.