Edit: This thread went off the rails a little in that the top comment is an indictment of religion (and me as a purportedly religious person) rather than an answer to the question. For the record I am not, and have never been, religious. I did go through a spiritual period, long ago now, but it wasn't associated with religion or God. Cheers, though, to the non-proselytizing religious Tilderianites who are trying to be good humans.

Clearly I should have done a better job of anticipating the potential misunderstandings but the ship has sailed.

I didn't want to steer the conversation by leading with my own thoughts about what the answer might be, but I've posted them now that the thread, like religion, is waning.

Don't let it stop you from posting your own take!

The question, rephrased is: As religion plays a progressively smaller role in society, how will we fill on the gaps that leaves? See below for example gaps.
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I realize that the title is maybe evocative because it presumes that religion is going to wane but statistically it's reasonable. The percentage of the population that identifies with a particular religion correlates inversely with the education level and wealth of a country.

As countries develop, religiosity decreases. There are probably exceptions, but I don't think the numbers leave room for much debate about whether or not religion is declining globally. In fact, if you look at just the western world, excluding developing countries where both religiosity and fertility are high, the numbers are even more stark. Presumably as education level and quality of life in developing countries improves they will have a similar decline in religion to other developed countries.

Assuming climate catastrophe doesn't dramatically set development back for everyone of course. Totally a possibility but humor me and, for purposes of this thread, let's not speculate too much about that.

I realize also that none of this is really new information, just establishing context, in that spirit...

Historically religion has served some very important needs. Among them:

• Community. Religion has been a key part of community in much of the world. We know humans need it, for all sorts of reasons, and I believe that right now we can see some of the problems that arise when they don't get it.

• Meaning. Vitally important to mental wellbeing and well covered by most religions. I think some of modern society's ills are partially attributable to the meaning void left by declining religion. Meaning here referring both to meaning in the personal sense as well as meaning in the larger sense of being part of something bigger than yourself that feels deeply important.

• Mortality. A key selling point of most religions is that they answer the question of what do do with the problem of impermanence. I think it's clear that, under the surface, many people are deeply insecure about their mortality and that it subconsciously informs their behavior in often not so great ways. So solving that problem with eternal rewards or whatever has been very important to the health of societies.

• Decency. Religion usually lays out what constitutes being a good or bad person and establishes rewards and punishments to encourage people to be good. Note that I'm not saying an external set of guidelines is required for people to be decent, only that historically that role has often fallen to religion. As a result, a lot of our modern values have their roots in ancient belief systems.

• Organization. Religions have often been at the core of important initiatives to improve people's quality of life and step in during disaster. They provide an ostensibly well meaning third party around which to centralize efforts.

• Faith. There are definitely downsides to believing things without evidence but as a temporary coping mechanism when things fall apart, faith is hard to beat.

And more of course, I'll stop there for brevity.

I'll skip laying out the downsides of religion, for better or worse it's declining and will likely continue to decline. I think that's enough for purposes of the question: How do we replace it?

What are we going to fill the voids opened up by waning religiousity with? I have a lot of thoughts about the topic but no real universal answers. And I think it's a question we're going to need answers for, especially as we go into worsening global insecurity caused by climate change, wealth inequality, fascism and so on.

We're going to need foundational shared values. Is that possible without a centralized authority?

I realize it's a giant topic, I won't bias it with my own thoughts going in, feel free to take it in any direction you want.