I had to look up "efficacious" and "raison d'etre".

This is from Jerry Coyne's book Faith Versus Fact:

Mike Gus, a liberal Protestant pastor, eventually left the church when he realized that Christian doctrine on Adam and Eve didn't square with evolution:

Really, without a doctrine of original sin there is not much left for the Christian program. If there is no original ancestor who transmitted hereditary sin to the whole species, then there is no Fall, no need for redemption, and Jesus' death as a sacrifice efficacious for the salvation of humanity is pointless. The whole raison d'etre for the Christian plan of salvation disappears.

•••••••••••••••••••••••••••••••••••••••••

That's very nice. A preacher figured out he was preaching bullshit.

There is a much more simple reason to throw out Christianity:

The whole thing is fucking ridiculous.

The Magic Jeebus Man was sacrificed for the salvation of human apes? What fucking bullshit. This is way beyond insane.

The Magic Jeebus Man magically became a zombie? Bullshit. That's fucking impossible.