I am a Christian, a skeptic and a man of Science - nice to meet you.
I think it's important to destinguish between Atheism as a belief an Atheism as a belief system.
To begin with - what is Atheism?
Atheism is not believing in a God - I say a God because Christians are technically Atheists - they don't believe in Zeus. That's important, because it demonstrates that Atheism is not actually a rational position, it can be arrived at by other means.
So what is Atheism as a belief system?
Atheism as a belief system is not believing in any God, or any supernatural forces, everything has a rational explanation. That in itself is not exactly a rational statement - for one thing you can usually throw out a weird coincidence or bizarre event that can't be explained by mundane mechanisms. The Atheist will respond to this nby saying "we don't know enough/don't have all the data". He cleaves to his belief there is a rational explanation even in the face of conflicting evidence.
That's not to say Atheism is unreasonable, it's as reasonable as Theism and like Theism there are intelligent and stupid positions.
How does this reflect on the CKII period?
Well, for starters there are no groups studying the Greek Atheist philosophy, both the Christians and Muslims are studying Aristotle and trying to synthesis his metaphysics into Christianity, Plato is largely neglected and the great atheists like Protagoras and Epicurus are so ignored that virtually none of their work has come down to us. It was not read so it was not copied, it may have been actively destroyed.
In India the situation is much more complex, and I am much less knowledgeable but I can say with some confidence that whilst early Buddhists did not believe there was an all-powerful God ruling the universe they generally DID believe that the beings worshipped as Gods existed.
So that's your general landscape, and frankly most people don't have a strong opinion one way or another on these matters - then or now. Atheism is as much a minority belief as it was a thousand years ago, as is really strong Theism. The difference between then and now is that we live in a very pluralistic society today - where people don't generally try to force things down your throat.
Go up to the average person today ask them if they believe in God and you'll more often than not get one of these answers:
"Well, maybe, I don't know."
"I'm not sure, but I think there might be something out there."
"Probably not"
"I like to think of myself as spiritual."
Question them further and you'll often find that even avowed Sceptics believe in things like "luck" or "chance" or some other odd superstition that's not entirely rational because we are not entirely rational beings. We tend to go with the general flow of society, too, and a lot of us will believe what "experts" tell us about a given subject without exerting a lot of critical thought, because we have better things to do.
ya know, back in the day how people all said that John the baptist only served as a precursor to Jesus Christ? how Jesus served as a precursor to Muhammad, and to the one prophet that mormons revere. You don't believe in any of those religions because you think it's silly right? They were obviously lying! But then why do you believe in Jesus Christ? When you should believe in John the Baptist? He was the first and there wasn't a soul before him.
Josephus writes that Jesus lived around the time of the First Jewish Revolt and besides the New Testament making multiple allusions to this time period there is also this piece.
"But those mine enemies, which would not that I should reign over them, bring hither, and slay them before me."
At the beginning of the First Jewish Revolt there was tons upon tons of bloodshed of Greek heathens hundreds of thousands were murdered because they 'did not believe'. I don't know about you, but someone who's idea of bringing about the kingdom of heaven to earth is slaughtering all those who oppose him, that does not sound like someone I would like to be worshipping. Also proclaiming yourself to be the son of a god is something a lot of Greeks did, particularly Greek rulers, more for prestigious purposes rather than beseeching a divine right to rule like the Romans saw it, but the Roman Emperors more or less regarded themselves as 'living gods' just like Jesus. The living/not so living god.
Why do I say these things? Because I'm tit for tat that CKII doesn't have a cult focusing for John the Baptist. The closest thing I can get to is Arianism. Although perhaps blame really shouldn't be thrown to the CKII development team as the earliest they go is Charlemagne and by that time most of the gnostic sects had died out. But I'm playing the mod 'when the world stopped making sense' which is in and of itself based from a biased opinion because it only 'stopped making sense' in that the Roman Empire lost control of the Western half. It starts in 476 and that is still a viable time for the gnostic sects. Perhaps I should suggest it to the creator of the mod...
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