And, in reality, this is just one little proof of many.
If you don't understand the proof, look at the evidence listed in the proof. It is the common evidence that anybody can understand. It's called nature. So far, God is the best, most realistic, explanation for the existence of nature that we have.
For those who understand the proof and the evidence of nature, believing in God is simply believing the things that He tells us. And none of it is against the idea that everything is a God-made simulation.