I'm pretty sure the Vatican's (by which you I assume include the entirety of the Catholic Church) art assets alone top the $10-12 billion you're valuing the entire church at, to say nothing of their property, 1 billionish loyal followers or legal status as a country.
Nah, he's done that by inheriting a bunch of rather blood-soaked wealth and then being fairly effective at predicting which companies he could buy that would then make him a lot of money.
Reality doesn't care if Musk doesn't care. For certain purchases, there's a probability that Musk will simply find that his money is no good. Not for sale to Elon Musk at any price.