So, "Unsong" by Scott Alexander. In this alternate history, Apollo 8 never reaches the moon, because it hits and cracks the celestial sphere surrounding Earth.
Turns out the torah and kabbalah are literally correct in this universe.
The crack in the sphere is how lights gets in to Earth: divine light, Names of God giving the speakers power, but also magic, suddenly working. Of course, this being the US, this gets exploited for money-making.
(1/n)