Needs a name, like the "You haven't applied the same logic in the other direction" fallacy.

https://en.wikipedia.org/wiki/Pascal%27s_wager

Pascal's wager is a philosophical argument advanced by Blaise Pascal (1623–1662), seventeenth-century French mathematician, philosopher, physicist, and theologian.[1] This argument posits that individuals essentially engage in a life-defining gamble regarding the belief in the existence of God.

Pascal contends that a rational person should adopt a lifestyle consistent with the existence of God and actively strive to believe in God. The reasoning behind this stance lies in the potential outcomes: if God does not exist, the individual incurs only finite losses, potentially sacrificing certain pleasures and luxuries. However, if God does indeed exist, they stand to gain immeasurably, as represented for example by an eternity in Heaven in Abrahamic tradition, while simultaneously avoiding boundless losses associated with an eternity in Hell.[2]

Unfortunately, the actual scenario turns out to be that the Spider-Goddess is running the show, and that She rewards only Her beloved atheists with eternal pleasures in the afterlife and tortures for eternity in Her Web the heretics who adhere to Yahweh.