

You’re anecdote is nice and all, but it’s an anecdote.
I couldn’t find much data specifically on rates of students of religious schools leaving that religion, but what little data I found says more people stay in the religion when enrolled in religious schools than not.
https://www.jstor.org/stable/4621974
https://www.sciencedirect.com/science/article/pii/S073805932500238X
Most students in religious schools have very religious parents who indoctrinate them from early childhood, and my anecdotes are different from yours. Few students decide that losing their friends and support system are worth leaving the religion, and remain in it even if they have doubts. The more you force religion to be a part of a person’s social support system, the tighter you hold them in.
I agree that if they start reading and studying it honestly the more disillusioned they’ll become, that’s my personal experience also. But most people in my experience do not have the critical thinking skills or the ability to study independently to come to those conclusions, they rely on the religious text being interpreted for them, and they accept a figure head (priest or pastor or Imam or Rabi) to answer difficult questions and reject anything that makes them “question” their faith, because they’ve been warned about the evil world that will try to get them to question their faith their whole life. They don’t begin engaging critically with counterarguments because religious apologetics give them comfort.
Cult members might be fooled, but cult leaders aren’t stupid, they know what they’re doing. They’re targeting people who aren’t in religious schools, and don’t have religious indoctrination already, so there’s no effect on “leaving” the faith to consider here, any hooked student is a success.



“Reasons”
Everyone who dismisses why Harris was an unviable candidate as “reasons” is just as bad as Trump voters.
Trump voting is not the fault of people who refused to vote for “most lethal military” genocide supporting Harris, it’s the fault of everyone who voted Trump first and everyone who voted for a genocidal unviable candidate second.