Q: Could God have existed forever? Is it actually feasibly possibly for some ‘being’ to have just existed, infinitely?
Without knowing more about the exact properties of gods, there’s not much to work with. The best way to answer this is to get a few thousand gods, and see if they last forever. If most or all of them do, then there’s a good chance that any particular god/being could last forever. Even logic and inference have to step aside for experimental results (or more precisely, the assumptions that the logic is based on has to step aside). As for things that existed “before the universe” (even assuming that makes any physical sense), nothing can be said at all.