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Take ten or twenty thousand children, take over a fairly large portion of a midwestern state, build a large and complete environment for them to live in including towns, museums, theme parks etc. and raise them as normal Americans but absolutely 100% avoid introducing them to the concept of religion until they're 25.
Before the oldest turns 24, that small city would just sublime into a higher plane, leaving behind nothing but a beautiful prairie and a fresh minty smell.
I suspect they'd invent their own. No one introduced religion to humanity. It came from within.
Then the experiment would yield data.
It would yield another religion, originated in a group that could parley their forced participation into fame on social media, which might lead to many more followers and eventually a holy war with the Mormons. Hmm. Might be worth a try.
I'm pretty sure that they would start making one up very soon.
I'm not meaning dump 20,000 children alone in the left half of Wyoming, I mean, keep them with their parents, hire teachers, teach them math and science and...basically a history that replaces a lot of "and they believed their gods said" with "the ruling class decided they wanted to". What happens to children when they are raised in a functioning, supportive, nurturing society that does not contain religion or superstition?
Many developed countries are majoritarily irreligious. But it's also hard to draw the line between religion and culture.