True in what regard? But here's the dilemma I believe is expressed in the OP. If someone has a religious belief that, let's say this one person is supposed to the prophet of the age, and they discover through rational inquiry that a lot of that is just smoke and mirrors to inspire people to believe in them, what then happens?
If the religion isn't actually "true" in the sense of the way they were told to believe in it, then how can the placebo effect work for them? How can they still believe, without being asked to sacrifice their rational minds in order to do so for the benefit of faith?
I can tell you this is the same thing for anyone who has deconstructed the Christian religion, such as I have. No longer do I believe in a literal 6 day creation. No longer do I believe that the Bible is the literal word of God without error. I see the construction of it as a human work, full of both faith, and flaws.
So the question is, once you see that the Great Wizard of Oz, is a religious production, and the faith you had that Oz was that image projected on the screen, now has the knowledge of the person behind that image controlling the levers, what happens? How do you rescue the baby of faith or belief, the benefit from that placebo effect, once you realize Oz is a created mythology, and not literally a reality in the ways in which the mind imagined is as?
What happens to faith, once belief is so confronted?
That's the true quandary. Do we just go into denial and try to defend the beliefs? Try to prove science is wrong and the earth is 6000 years old? Do we try to support the idea that our chosen prophet is the true prophet? Do we become defensive and build up our apologetics to protect that image of Oz and deny that there is a man behind the curtain?
How long can that be maintained? What happens when we can no longer be dishonest with ourselves about that? That is exactly the place I found myself. But how can faith be held, when the structures of belief are not longer strong enough to support the mind? How could I still have faith, without being asked to commit intellectual suicide for its gains?