What to do with the returnees?

[Philippus Flavius Homovallumus]

How do you know?

Because the concept of "sanctity" is a form of superstitious fear, our ancestors saw fast running rivers they were afraid to cross and to justify their fear they declared these rivers "sacred" bariers their Gods prevented them from crossing.

You said you were an atheists, so no sanctity (superstitious fear) and no belief (assertion from ignorance) for Brenus.

[Husar]

You said you were an atheists

I did? I do not remember. Might be my fault though.

[Brenus]

"You said you were an atheists, so no sanctity (superstitious fear) and no belief (assertion from ignorance) for Brenus." These are your definition of atheism. I am atheist: I don't believe in a ET as a creator. Full stop. I have my own system of beliefs, based on hope and faith (which I know mostly hopeless) in Humanity.

@ Fragony: Marxism (or others political/economical ideologies) doesn't claim to be out of criticism and out of time. So when an aspect of it becomes clearly outdated, it is just abandoned or adapted (Marx couldn't foreseen Mobile Phone and macro-waves. Jules Vernes might)
Religious texts claim to be given by all mighty creature, so a-temporal and for ever valid. And this ET should have known that slavery was bad, and genocide bad, and rape of young girls bad, etc. Religious books are blocked from evolution and adaptation by their own claim to be God's words. The Gods can't make mistake, can't contradict themselves, you know, kind of "ell, when I said don't kill, few years ago, just to be clear, what I meant was don't kill the faithfuls, you'd know, people believing in me. Now, the others following the other one, the false one, the usurper, these are fair game as slaves (have fun with their daughters) and for slaughters. I am clear?".