What they've done is absolutely genius they've purposely filled our minds with things that are beyond belief.

They've made things that in their world are everyday ,common events. But to us exist only in fantasy movies and horror books.
Things like magic and ritual.
Other worlds or maybe just another part of this world we've been kept from since the beginning.

When they die they simply fall out of our fixed point of view and move on to live out their days in their own version of heaven on earth.

Its such a great lie and our minds have been so greatly deprived of all of what this world has to offer.
That even if the lies were to be exposed the people the true victims of this lie wouldn't and couldn't bring themselves to believe that everything they thought they knew were nothing but deception draped in deep dark lies  .
All to preserve that other here that we are not allowed to see.
And our minds have been made unable to believe in.