...that's like sidestepping the myriad of questions we have about religion and just demanding proof of something unprovable!? What religions are you talking about, all of them? Did someone make up Christ? Muhammed? Siddhartha? Or did they make it all up themselves? Proof is irrelevant when it comes to religion, to my mind, it's a recent invention.
This is your oddest question yet..
I believe we have evidence of Mohamed outside the Quran...
But when it comes to Moses, Abraham, Jesus...don't have anything contemporary outside of the bible.... ya gotta have faith.
Siddhartha? Isn't he proof that he made up Buddhism....sat under the tree till he had it figured out...