How does anybody know whether the world we observe is independently real or is nothing more than a sophisticated DIGITAL simulation running in the mind of God? All humans, including "scientists" ultimately have to BELIEVE or not what their senses and their extensions tell them about the universe. There is no way we can say for sure that what we think is "real" is in fact so. A sufficiently advanced Technology is indistinguishable from a miracle and a sufficiently detailed and sophisticated simulation this indistinguishable from "Reality".
The universe has characteristics of a digital simulation. For one thing, time, space, matter-energy each have a minimum quantity beyond which they cannot be divided. Our universe is quantized. It has a finite number of particles and a finite number of states. That means it is computable. All digital processing also occurs in bits that cannot be made smaller.
It appears that the Big Bang came from nothing. EVERY SIMULATION always starts from nothing whenever the simulation program starts running, Our universe has a speed limit. It is the speed of light. That is a fact, but nobody knows the reason why the speed of light is any particular speed and not arbitrarily faster or slower. EVERY SIMULATION also has a speed limit. It is the maximum rate of execution of the program. Life and the various lifeforms appeared suddenly. In EVERY SIMULATION new things come into being, where nothing like them existed before.
Werner Heisenberg, the originator of the quantum of uncertainty principle stated, "atoms or particles themselves are not real; they form a world of potentialities or possibilities, rather than one of things or facts.” (Physics and Philosophy page 160)
All we can do is to either BELIEVE or DISBELIEVE what the programmer of the simulation may have revealed, if anything. That is why God tells us in the Bible that it is impossible to please him without faith. EVERYONE has faith in something or someone.