The Heavens Gate crowd died for their beliefs, and they believed in space aliens not gods.
The atheists don't believe in divine machinations, because there is no evidence of anything divine.
And each theist has their own brand of belief-- none of them have any measurable evidence for their claims of divine knowledge and every one of them is wrong according to some other person's beliefs. Per the evidence, none have more truth-value nor explanatory power than any other once you get to their "supernatural" claims.
There's one reality, but an infinite number of potential delusions about that reality.
In doing the math, I find the "belief" side wanting. I think the non-belief side is far more likely to be the winner when it comes to whether there are invisible immeasurable entities. Until there's evidence, there is no way to tell such real entities from all the imaginary ones people have been making up anyhow.
So, though your circular argument might work for a brain made soft due to marinating in faith for years, your logic fails utterly. Your "magic man" explanation has no more explanatory power than all the other invisible gods, myths, and imaginary beings that people have believed in over the eons. It's actually worse than the space alien belief, because, any sufficiently advanced species would be indistinguishable from gods to us lesser folks--just as we would seem to be gods with our knowledge and technology to people of eons past. Each believer has their own little confirmation bias as to why the story they've been indoctrinated to believe in is true-- but they all rest in on this bizarre idea that somewhere back in time some mortal got messages from some invisible guy (who is indistinguishable from a delusion) via some revelatory process (also indistinguishable from a delusion) and wrote it down in some manner (though we never seem to have these originals) to spread to future generations whom the invisible guy, apparently, doesn't feel like talking to (or not in any way that is distinguishable from a delusion anyhow)-and somehow today's believer just happened to be born into or stumble upon the right and true version of this story unlike all those other deluded and wrong people of eons past and present who believe in a false myth that comes from a long line of hearsay heresy.
All this speculation, but no evidence that there IS a divine anything... and no evidence that any mortal ever could access it even if there was.-- Couple this with the reams of evidence that people are easy to fool regarding such beliefs--tons even die for such belief and/or kill for such beliefs. (Of course, they all seem to believe that the dead folks are going on to some next life, so I guess it's not really death after all.)
Thanks, I'll stick with the rational scientific side when it comes to understanding reality.