You get it. Religion sets the memes for society, and the memes decide what society we live in. A very important meme is "in Diversity is Strength", and this is best reflected by a polytheist religion.
The problem with modern forms of paganism is that they are generally aiming to copy existing monotheistic religions, instead of creating something brand new. "Lord and Lady" - you might as well read "Jesus and Mary'. For "Priest", simply substitute "Priestess".
We do indeed need a new religion, but I believe we need a new religion based on sound, scientifically based principles, which are then added to, decorated, embellished, with myths of all kinds.
In the present context, you and I agree that "Diversity" is a key need for a robust society. Science (ecology) shows how diverse ecosystems are robust, whereas monocultures are weak and easily toppled. Thats the scientific basis. The next step is to turn this into a meme - for example, "Strength in Diversity", or more explicitly, "Diversity is more robust than uniformity".
The next step is to enshrine this into a mythology - a transparent mythology, stories that people know to be just stories, not historical truths - explaining the various aspects of this idea through storytelling. And of course, one could invent a pantheon of gods in this story to mirror it.
But this is just one of the many crucial memes.
The important point is to uncover the memes that are running our civilization into the ground, to develop new ones that are more appropriate, and to insert these into our new cultural narrative.
I believe a religion with all the trappings is a suitable vehicle, but so also are plays, books, movies, songs.. Ideally, there would be a core "priesthood" devoted to ferreting out memes and engaging in the required Noo-engineering, but the expression of the religion could play out across many spheres of human activity.