If you were there, when the Big Bang happened, and have complete knowledge of how every particle would interact with every other particle from then until the end of the universe, then you could with 100% accuracy predict every action, every thought, every happening that ever happened and will ever happen.

That in itself proves that the universe is one single happening, which seems to be many happenings only for those who do not know all of the story. However: There is the perception of free will, and there is the perception of determinism. I experience free will, and that makes it real to me.

From a certain perspective, I also experience determinism and that makes it real to me. Therefore determinism is free will, and free will is determinism.

They are One with each other.

I think, this reality is akin a highly interactive movie. We interact with it, experience it, and feel free within it to live our lives. Yet, the movie is complete. It is in the most basic interpretation, entertainment. And our lives, the movie we decided to watch.