> matter tells spacetime how to curve.
Even worse, at sufficiently small scales, spacetime doesn’t seem to exist either.
“sufficiently small scales”
Physics on a quantum scale is pretty mysterious. Particles existing in two places at once... Multiverses... This is real Fantastic Four stuff here. There’s a lot to speculate about but not a lot to make conclusions on. For these cases, as Boghossian observes, certainty is an enemy of truth, or... make room for God.