Repeated attempts with a larger group of people will indeed yield results. You don't have to be a believer for it to work. I became a beliver only because results cannot be explained any other way.
By the way. I believe those things open you to spiritual invasion. You don't have to be a believer for that danger to be real either.
“By the way. I believe those things open you to spiritual invasion. You don’t have to be a believer for that danger to be real either.”
That’s a fact.