What is the Unifying Theme of Infinite Multiverses, The Simulation Hypothesis, and God?

We should not stop striving in Science and Philosophy when progress slows and we hit seemingly intractable difficulties

Does the Universe branch into different copies whenever a particle of light zigs this way when it could’ve zagged the other way according to the laws of Quantum Mechanics (QM)? QM is the most precise and accurate theory we have that underlies the microchips that power modern society, so…