Yep, not much profit over long time horizons in correcting a relatively small number of people who are either delusional enough to believe in second comings or think it's a fun bet
To add to that, even if there's zero probability of an actual Second Coming, there's nonzero risk whatever oracle a betting market uses gets hijacked by Second Coming believers who resolve some new Jesus.AI or declaration by a cult leader as representing the authentic return of the Biblical Jesus, plus risks of exchanges defaulting on all bets or your winnings being locked up for gambling-restriction related reasons. For related reasons, you could earn money betting on Trump winning the most votes in 2020 after they'd been counted.
To add to that, even if there's zero probability of an actual Second Coming, there's nonzero risk whatever oracle a betting market uses gets hijacked by Second Coming believers who resolve some new Jesus.AI or declaration by a cult leader as representing the authentic return of the Biblical Jesus, plus risks of exchanges defaulting on all bets or your winnings being locked up for gambling-restriction related reasons. For related reasons, you could earn money betting on Trump winning the most votes in 2020 after they'd been counted.