When you dig into the younger years of Muhammad...his uncle was handling the “kid” and they were traders. This meant that one of the chief features of their occupation...was traveling around. So you got to move into different circles. Few people grasp this angle to the story.
In this period...630AD plus...you’d be surprised how many religions existed in the Middle East....literally hundreds. Mecca? It was a trader’s paradise but it also had a religious fest each year....for various groups to meet up at the Black Rock...as part of the fest.
So, Mohammad and the Uncle traveled around and he had thousands of opportunities to mingle with various religious groups. Eventually, he fell more into the religious angle, than the trader angle. I think you’d say...he was drawn to some answer in life. Eventually, he invented his own religion, using bits and pieces of what he’d picked from various Jewish groups and other religions.
This ‘before-Mohammad’ Koran? It’s a shocker because they had attempted in the period after Mohammad to gather up and destroy all the old copies, and issue out the official Koran. Oddly, this piece survives.
If you were looking for some angle to bring down the entire Islamic religion...you need to find more such editions....all prior to 630AD. One of the best places where such things might be found....is the library of the Vatican. But these guys are so screwed up on inventory....they could spend decades hunting through their archives.
Muslims destroyed a lot of their own history to ensure the account of their history is pleasing.