I'll recap the key sentence....
"It's just that some people can see it & others are waiting for something spectacular like in the movies, but when such spectacular thing does happen (e.g. Judgment day) then they will realize at the bare end He exists & it will be painful realization for few reasons."
Well, you may not have meant it as a threat but it reads as a threat to me, it will be a 'Painful realisation' !!
Whether I believe it or not is irrelevant and I'm certainly not waiting for it.
btw. I think the alternative, heaven, is just as awful a place. I struggle to imagine anything so unbearable.
When you for example (in a joke) mention someone's mother in offensive way & the guy next to you tells you that that someone's mother passed couple of days ago - would you consider it a painful realization? Of course you would.