I’m a believer in the substitution hypothesis ie that humanity is predisposed for some sort of religious belief (or need to believe in something bigger in ourselves that we can share with others) and if no religion is available something else will take its place which will be given the same devotion and need to proselytise and inspire destructive impulses. Soviet communism and Maoism are examples as is the TRA cult. I think organised religion is almost a necessity (in evolutionary, psychological, and sociological terms) in civilisations where living in groups of more than 150 is the norm as it’s a common bond and reference point that can tie a community together. If it’s not organised religion it’ll be something else and so far the ‘something elses’ are more horrifying.