I'm so glad you asked
One must believe in reality. Most believe in science, because science to most simply means "reality". Most deny the divine, because they don't see it as any sort of reality. But the religious are not arguing for an un-real abstract divine realm, but a real existing divine reality, usually outside of space-time of this universe (ie it literally doesn't exist within physical reality, but "outside" of it).
Do not give me a "muh no proof" tier argument, there is tons of philosophical proof, including even scientific facts established by experiment that near inescapably suggest there is a reality beyond nature, the most obvious of all of these being that there wasn't anything physically there to create the universe, meaning it must have been created by some non-physical thing outside the universe. The list of things that aren't physical that exist are very short; abstract numbers and God - and abstract numbers cannot do anything. In the end, the best option is God.
However of all the proofs of God's existence, my favorite is probably the historical evidence of the Resurrection. If you were wise, which I know you are not (you sound like an edgy teenager who's bitter in losing an argument) I might use it on you, but you're probably too Jewish and will just waste time slipping around whatever I say. To keep it simple; each and every one of the 11 apostles were martyred. If they made up the Resurrection, it is insane to think they would martyr themselves for something they know is a lie, and can expose the lie to save themselves. Multisensory hallucinations are exceedingly rare, and this would need to happen several times in low stress situations in a non-comforting way (all of which utterly destroy any chance of the hallucination theory working). And the early creeds tell the basic story of Jesus that he was resurrected from the very start, meaning it wasn't just made up later. The best theory to explain the ressurection of Jesus is that he really did rise from the dead. Also worth mentioning that the evidence that Jesus was indeed crucified is incredible, and most historians do in fact believe they did see post-mortum appearances of Jesus somehow.
Really the simplest evidence, is that this was eye-witness testimony split over 4 apostles that tell the same story of Jesus Christ. When you think 4 independent sources coming together and all dieing for the truth, what can be a better pattern of truth than that? Their actions and the very rise of Christianity can simply only make sense unless they were really telling the truth.