Gutenberg was a grifter. He stole money from people, sometime his own family, and ran up debts that he couldn’t pay.

The only reason that he started printing bibles and became religious was because he was going to be thrown in prison for swindling people out of money, and it’s a bad look to throw someone in prison who prints the word of God. In fact, most of what we know about Gutenberg comes from his court documents.

Also movable type and the printing press were already known in Europe and had already been invented in East Asia several hundred years earlier than Gutenberg. (the first printed texts date back to 700 CE and movable type prints around 1000 CE, both in modern China). It was nothing new.