It depends what you count as a casino. I grew up in Las Vegas and there's slot machines in most grocery stores and gas stations. Also the airport has slot machines. If that counts as a casino then there's hundreds if not thousands.
I've never been to Vegas, but I've heard more than one person express surprise at how much more city there is besides the casino strip? No idea if that'd make up for the casino density on the strip
There are the BIG casinos, which only take up a finite space, but there are also little casinos pretty much everywhere you look. Even gas stations will have slot machines. That's true of most of nevada, tbh.
While gaming tokens do turn up in the collection plates of Las Vegas churches, those churches (Catholic or Protestant) don't all send them out to a "nearby Franciscan monastery" for sorting and redemption by designated "chip monks." Churches generally accumulate gaming tokens until they each individually tab one or more of their workers to take the chips around to casinos and redeem them for cash.
It is true that one church in Las Vegas, the Shrine of the Most Holy Redeemer, once had a Franciscan friar on staff who made the rounds of casino cages and thus, in the fashion of the joke, he was dubbed "the chip monk." Church Employees tasked with handling chip redemptions at various Las Vegas-area churches are sometimes also referred to as "chip monks" in furtherance of the joke, but they are neither real monks nor are they employed by monasteries that sort and redeem the tokens.
And if they could collect such an impressive amount of chips that they would be able to form hills of them and then work between them in the valley...
...they could be called The Chippendales.
So what happens in Vegas, stays in Vegas. I'm out.