I mean if you believe the Universe and time are infinite then you are forced to believe that every outcome will happen at some point, you have no choice, and you also have to believe events repeat for infinity. UNLESS you believe there is some higher intelligence directing them in a specific direction and it isnt random infinite combinations occuring.

Are they happening at the same time in parallel Universes? No I dont believe so. The Ether is like all bodies of water, it is in density (pressure) layers where some entities can go all the way to the top and the bottom and like whales and sharks etc and some are stuck in a very narrow zone they were made for like lobsters and shrimp etc. The "angelic" beings (demigods) can travel from the lowest density areas in the top realms down to ours and below of course, but we are stuck in these avatars at this layer sadly, for now anyhow.