The idea that leftist political movements have a great deal in common with religions has been around for a long time. There has always been quite a lot of truth in this idea. Political zealotry does obviously resemble religious zealotry, and the various leftist splinter groups (like Trotyskites) can be seen as heresies.
And of course the clash between communists and National Socialists can be seen as a religious war between two competing sects that had a great deal in common but differed on a few key points of doctrine.
What is different about today’s leftism is that it is purely religious. The cult of Social Justice has no actual political content at all. There is no underlying political ideology. Communists and fascists and Trotskyites and National Socialists had actual plans to remake society. Their plans were often wrong-headed and in practice were usually disastrous (although Italian Fascism worked moderately well and might have survived long-term had Mussolini been able to achieve the alliance he hoped for with the British and the French). But no matter how wrong-headed the plans might have been all these leftist sects did have reasonably coherent plans to construct a new society.
Today’s Social Justice Warriors have no such plans. They have no objectives. Their religious fervour is an end in itself. They’re jihadists but it’s the jihad itself that matters to them. If they won they would have no idea what to do next. In fact they have won the Culture Wars and they really don’t know what to do next. They can’t comprehend that the only real winners are the billionaires who fund their jihads.
As Helen Andrews points out in Politically Correct Holy Rollers: The New Campus Revival their motivations are similar to the emotional and religious fervour of the 19th century Christian revivalist movements.
If SJWs were genuinely working towards bringing about the Glorious Socialist Revolution I could understand them and even respect them, even if I strongly disagreed with them. But they have no real interest in socialism. Most of them are comfortably middle-class (or even wealthy). They are for the most part incredibly privileged. The last thing they want is actual socialism.
The SJW thing is not a political ideology and it has nothing to do with politics. It’s about religion. They don’t want to replace capitalism with socialism. They want to replace Christianity with their new warm and cuddly feel-good religion. That’s why they’re so venomous towards Christianity – Christianity is their rival religion.
In fact SJWism is a kind of Christian heresy – it’s Kumbaya Christianity with all the actual religious content removed leaving only the fuzzy caring and sharing bits. That’s why Kumbaya Christians and SJWs get along so well – there’s really not much difference between them.
SJWs are religious zealots. They’re not political ideologues. They don’t even understand politics. They’re not interested in political change. They’re funded by billionaires. They’re looking for salvation.