Of course the don't require supernatural beliefs, but has there been a successful pre-modern society without a supremacist self-concept?
How long do you think a Secular Humanist regime would have survived in the pre-modern era?
To spread your values you first have to survive.
Still don't see what that has to do with my point.
Not at all. Anything bad from Christianity could have come from an analogous source.
The claim that, for example, the homophobia in Christianity originated from some earlier belief set is stating the bleeding' obvious, because Christianity itself originated from some earlier belief set. It's like an abuser claiming they are not responsible because they were abused.
Which successful pre-modern society wasn't intolerant, divisive and oppressive?
I'm not necessarily talking about pre-modern societies. The same principle applies today.
The idea religion is primarily divisive though seems as wrong as it is possible to be though.
You really think that claim is the epitome of wrongness? My, you must have led a sheltered life.
It only makes sense if we assume people are naturally united until something appears to divide them.
That would actually seem to be the case.
If we start from the perspective we are divided by default,
To borrow a phrase, that seems as wrong as it is possible to be.
particularly in a world without modern communication and transportation technology, what historical force has united a bigger and more diverse range of people than religion?
Given not only the incessant conflict between religions, but also the ceaseless sectarian conflict, the claim that religion is essentially a uniting force is clearly wrong.
Yes of course it can divide too, but not more than it has united.
That depends entirely on perspective. Undoubtedly the religious missionaries and colonial armies believed they were uniting the world for the better but not so sure the rest of the world saw it that way.
Unity requires something to bind, but this process necessarily also creates division.
Not so. Our innate empathy and altruism promote unity but do not create division. As you mentioned earlier, it is when some other element comes to play, like territory, resources, ideology, etc, that conflict arises.
If we were essentially driven by divisive impulses, the earliest communities would never have formed. To see what we are like in essence, we only have to study groups of higher primates.
Of course we can never truly know, but we do have many other modern and historical societies to compare with and these show our current values are rare.
Whose values?
As such we can say that it is less likely we would have had our current humanistic, scientific society without it.
How do you arrive at that conclusion, when the development of more tolerant, humanistic, rational societies has coincided with the decline of the ideologically driven ones?
I am yet to hear any examples of social benefits that could only have been delivered through a religious society.