1 - Then we seem to be discussing 2 different things. My point was that you need to replace religion with "something else" and I was asking what this new less divisive ideology is and you responded with environment and golden rule.
If you weren’t offering these as a replacement, what would you say is the replacement for the divisiveness of religion?
2 - Also, as you said religion is divisive and we should aim to replace it with something else, how would you explain this in the context of it not being a desire to change people towards your way of thinking?
I agree, we can work together with people with whom we share a common identity or common interests.
For complex, long term cooperation with those who you don't share an "irrational" bond of identity (or culturally defined obligation), you must share some "rational" common interests and also share the idea that any given cooperation is "fair and equitable" which is where the practice becomes much harder than the theory.
3 - The problem is we rarely have such well aligned common interests, and without common identity we don’t want to continually and repeatedly sacrifice our own good for the benefit of others.
I've numbered parts of your last post so that I can match my answers better. And if you feel I've skipped an important idea, let me know:
1 - I'll add a third possibility - wealth and income inequality. So I've offered three possibilities, when you include, the golden rule and climate change. Of those, I agree that the golden rule - while powerful - would probably be the hardest to get people to rally around.
That said, this feels like the old joke, "if you find yourself in a hole, the first thing to do is stop digging". And that's really the point of this OP, to make explicit the idea that the status quo concerning religion is humanity continuing to dig a deeper hole.
2 - I would say there are degrees to which you can attempt to change people to your way of thinking. "stop digging" is still a very open-ended suggestion compared to something like "focus on the climate" which is much more constrained request.
As I've mentioned in other posts, I think a good general rule would be to challenge dogma and to support non-divisive projects. In other words some people might choose to fight climate change, others might tackle fresh water, others might try to defang oligarchs. Those are all first order problems, and if they're approached without using dogma as a tool, I'd say we'd be making progress.
3 - I think tackling environmental issues and economic issues can be viewed as selfish projects. Sure, they'll benefit others, but they'll also benefit "we the people", no?