Humans have been walking the Earth for about 50,000 years. 10,000 or so of which has been “civilized.” 1700 of those years has seen Christianity. Approximately 400 of those years has seen Christianity spread beyond the Med-Euro who stole it from the Middle Eastern deserts.
I’m thinking that most of humanity did fairly well without Christianity and that we’d survive without it.
Billions and billions of good, moral humans have lived and died and been fortunate enough to never have heard of Abraham or his spawn.