In a sense, anything that's marketed to you leverages FOMO. "Buy today! Operators are waiting! Call in the next five minutes and get a second one for free!"

And of course it uses FOMO, because we're hyper-social creatures who dread losing social reciprocity. Religious faith offers group belonging in exchange for belief, and threatens group exclusion if you don't believe. Including the ultimate group exclusion: eternal perdition.

Well I certainly had it drilled into me that there was going to be a rapture. Jesus was coming back to earth to take the chosen with him. That I needed to be prepared. So ever time that hymn Just As I Am fired up, I was encouraged by parents and siblings to trudge up to the alter to be proactive and ensure I would be ready by getting saved over and over. Frankly I was petrified to go to the alter because I had no feeling about it or sense of doing something that I knew to be true and correct. I was just following instructions.