What would you do if you found out God existed

[possibletarian]

My point is we make educated guesses all the time. Just because there is no concrete proof of something doesn't automatically mean we should discard it as a possibility. Believing in the existence of the supernatural is no different.

There is a difference between having no concrete (absolutely undisputed ) proof, and no proof.

As far as the origin of the universe is concerned:

1. We don't have proof that there are certain things in the natural/physical world that have always existed or that can spontaneously start existing from nothing. In fact, we only have proof to the contrary. Things in the physical natural world have a beginning and come from something else.

Okay, it a very intuitive argument to say that things have a beginning and come from something else. though it would depend on what you mean by 'begin to exist' and what you define as something else. If it's an unknown or unknowable, then say exactly that.

2. We also don't have proof that there exists anything beyond the natural physical world which would defy these laws of nature - aka, the supernatural.

That's what science is for, to search for these answers. At one time for instance we didn't know what caused earthquakes, tsunamis, lightening and the like, now we do. They are no longer the anger of the god's but natural events. Thought insanely people do still attribute them as punishments from (insert your deity here) god.

If you say "there absolutely is nothing beyond our natural physical world", you're basically conceding that something in the natural physical world either has always existed or spontaneously came to exist, even though there is no proof that either of this can happen.

That's just the point, most scientists say they simply do not know how the universe began or rather what caused the big bang. In other worlds they are still in the excitement and joy of trying to discover that, personally i think it's a fascinating question.

If you say "obviously there is more beyond our natural physical world that is not bound by the laws of nature", you're taking a position that also has no proof.

Generally people say 'we do not know' when they do not know, that argument you outline would seem to me would be more likely to come from those who believe in the supernatural

Either way, you're making some sort of guess that is not based on concrete evidence.

I think you are justified in saying some are educated guesses, but generally they are educated guesses based on the world around us, or experience. But to use an example of buying eggs that you gave in another post there is a great deal of difference saying that you guessed your husband would buy some and took a risk, and saying you supernaturally knew that your husband had already got some eggs.