I believe in Einstein and Rod Serling's assertion that history is infragile. If one were to go back in time to try to assassinate Hitler in 1920, he would fail, because Hitler has, obviously, already happened. So, obviously, something intervened to stop that time traveler. Otherwise, we live in an infinite number of parallel, possible and impossible universes, and every decision made or not made results in a tangential fracture of the universe. Did you go to work today? If so, there's a parallel universe in which you didn't. Have soup for dinner? There's a parallel universe in which you had a chicken sandwich. And one in which you had a steak. There's also an infinite number in which you died today, and an infinite number in which you never existed. And so on.
It's been my observation that God doesn't work that way. God is stupefyingly simple in His stupefying complexity. Photosynthesis can be reduced to: "Plants use sunlight to make food." Two hydrogen atoms plus one oxygen equals a water molecule. Reality exists because of the relative gravitational strength of the particles of an atom. The Earth sits in the exact right spot within the habitable zone of Sol. Et Cetera.