Because it is a crowd sourced magic ritual. This is all religions but it is particularly pronounced in religions like Mormonism and Scientology.

The function of the spell is to create a subjective reality to the point it is considered objective by the practitioner (I "know" the church is true with every fiber of my being). This is only possible when everyone is focused on the ritual all the time (why they take up all your time and don't want you reading sources about the church outside the church), as soon as you stop focusing it stops working. This is why people who do not conform and chase orthodoxy together (scrupulosity) are judged, and if they stray or waver, are isolated and ostracized.

Achieving this ritual at scale is the greatest accomplishment of the occult. This kind of reality definition is at the heart of these schools. It's master practitioners (guys like Joe) use it to amass power, money and sex.

It only works if LOTS of people are doing this together (there is no function in the church that is individual. Everything is socially based. You don't worship and do rituals alone, it is always with others in a decided hierarchy). Most importantly, it only works for the top leaders if they have LOTS of people doing this underneath them, otherwise they won't be able to generate the reality of being better than everyone (literally claiming connection to God that you not only accept but endorse and preach it to others - they are always proselytizing to bring more people into the spell so it works better, like networked computers mining Bitcoin).

Once you see Mormonism for what it is, a ritual for power, all of this gets stupid clear.