When one gives up the Christian faith, one pulls the right to Christian morality out from under one's feet. This morality is by no means self-evident. Christianity is a system, a whole view of things thought out together. By breaking one main concept out of it, the faith in God, one breaks the whole. It stands or falls with faith in God.
There is such a thing as a hatred of lies and dissimulation, which is the outcome of a delicate sense of humor; there is also the selfsame hatred but as the result of cowardice, in so far as falsehood is forbidden by Divine law. Too cowardly to lie.
What good is all this free-thinking, modernity, and turncoat flexibility if at some gut level you are still a Christian, a Catholic, and even a priest!
In those days it was possible for a Greek to flee from an over-abundant reality as though it were but the tricky scheming off the imagination-and to flee, not like Plato into the land of eternal ideas, into the workshop off the world-creator, feasting one's eyes on the unblemished unbreakable archetypes, but into the rigor mortis off the coldest emptiest concept off all, the concept of being.