@spendius,
No civilisation without religion?
That is a strong claim, and I think an unjustified one.
Admittedly it is hard to think of a historical civilisation which was not tempered by some religion or other.
So many religions to choose from, too. Communism? Maybe an aberration.
But is it inconsistent to decide to choose none at all? Would our veneer of civilisation be thinner if we do? I don't think so.