I think there is something to what you say. I think humans have a longing to connect with something greater than themselves. Religion is an obvious answer. But so are football teams,. rock bands, Apple computers, hometowns, political leanings, and for Cliff Clavinn the United States Postal Service.
Historically, religions had a monopoly on this because people simply did not know or understand a lot of what they saw or experienced. As that has changed, religion is now only one place to go for answers. I am not comparing the value of what someone receives at church versus an environmental rally - that's an individual question. But both of those two examples provide people an explanation for uncertainty and a community of like-minded to belong to and feel safe with. Both of these satisfy that urge to connect with a higher power.
So I guess what I'm saying is that as more people have more access to more information (not necessarily accurate information), there will be more options to fulfill this basic human desire.
I had never heard of horseshoe theory until I read your post. I happen to agree with that. But instead of a horseshoe, I see it as more of a complete circle and that, taken to it's logical conclusion, the entities become the same thing. Regardless, it's a valid concept in my opinion.