In the event of Rapture, the value of real estate would plummet as it's suddenly vacated by all believers. And of course, so would the value of money. In a Christian majority country, those who remained would have all the real estate they could defend.

If the person who set this up has an actual network with maintenance costs, providing insurance in exchange for promises of real estate in the event of rapture would be an act of pure altruism, providing others with service at their own expense. While I'll applaud altruistic behavior, I'm not going to condemn what seems to me to be a legitimate example of wealth producing capitalist behavior. The buyers value peace of mind more than the money, and the provider values the money more than the time and work they put into the services.

Maybe my standards have been lowered recently by dealing with industries whose externalities render them wealth negative, but this doesn't look objectionable to me.