There is no first because we know there are no independent causes.
When Aristotle posited the Unmoved Mover, it was because he had a weak, linear understanding of cause and effect based on his understanding of the immediately tangible world.
However we now know that things are co-arising, every thing is both a cause and an effect simultaneously and that the order of events is relative to your perspective.
i.e. everything is god and it only became god and humans when humans separated god and humans, but humans were god before they were humans, before humans existed.
We were the universe before we took forms and decided that we aren't anymore.