Every person is religious

[Belacqua]

Ideologies. An atheist’s world view can be shaped by an ideology just as much as an Abrahamist’s world view can be shaped by Islam, Judaism, or Christianity.

Yeah, I don't know if everybody has a religious instinct, in the sense of metaphysical beliefs. 

But I agree with you that everybody signs up for an ideology -- whether they acknowledge it or not. 

Then the ideologies form into camps, with ours being better and obviously correct, and other people's being deluded and headed for some kind of demise -- either damnation or just fading away as a laughing stock as the world becomes smarter. 

The in-group/out-group thing seems unavoidable.