I think you are making a false distinction: what is the difference between a truth if I am told it and the same truth if I discover it for myself?
That is true, I suppose, but I'm not sure how it advances your argument. If it is your suggestion that before the Big Bang there was a period (I will use the term even though there weas probably no such thing as time) when all that would be was caused pending release then your assertion is no less unfounded, ludicrous and insupportable as is the eternal existence of a deity.
I cannot know in the sense you demand it: it is a statement of faith. Religions happily admit that their beliefs do not rest upon proven fact, but upon some other basis instead, such as revelation, perhaps. I agree that, if God has to be created, there is a problem over who or what created Him, but the causa causae problem actually does not exist for religions, only for science. God is not constrained by time. He is eternal. He precedes the Big Bang and everything that went before it.
This can be said of religious faith, too
You are making assumptions too, equally unfounded, based on your belief that there is a scientific answer to everything, and faith that it can be found.
God can be supernatural without being perfect. In fact, He could even be supernatural and thoroughly imperfect. I am thinking of supernatural beings such as Satan, the Daevas, Paantu, and so on.
Science was once a poor discipline, founded on thoroughly shaky principles that, for millenia, held back its own development. Religion supplied answers science could not. As scientific knowledge grew, religion was able to withdraw to its proper spheres of influence, which was to explain why we are here rather than what we are made of and how we work. Science can continue to grow and religion, though perhaps more focused on particular answers than before, can continue to develop in its search for Truth.
I cannot rule out the possibility that after Armageddon, or in whatever new order your preferred religion proposes, the people living in their new Eden will have transitioned from mere mortals to supernatural beings who are no longer bound by laws of nature.