Mine comes from my own terrible interpretation of wave existence/ string theory. I don’t currently think things where this dramatic but it’s still fun to consider.

There was a dimension, one far far smaller then our own. It is energy, hotter then any quazar. It’s not at all stable.

The little universe became too small for the energy it contained and exploded. It ripped a hole into (one or many) neighboring dimensions. Like drops of blood in gigantic pools of water, the engery is dissipating into the void.

Now if you must belive in a “god”. Think of how we are beings with millions of tiny lifeforms living on us. Not just our cells but an entire ecosystem of bacteria, virus, parasites, and other micro beasties we try not to think about. Those have life forms living on and in them. If this dimension of energy was like a living being like us, perhaps the proto life forms that built us where some of the things living on it. A tiny virus that was living on a cell of foot fungus living under “god’s” toe nail before it exploded into our dimension and eventually became us.