It makes a lot of sense that religion has been used for millennia to create a civilized society. Christian values are still held in high regard by Western countries today. Don't murder, don't steal, don't lie, don't cheat, honour your family, treat other people the same as how you want to be treated. That last point is lost on many people. For the alt left, it seems all of the points are lost.

Now you have people that denounce religion (except Islam), yet unwittingly they follow the religion of social justice movements like BLM, Greta Thunberg, or whatever the flavour of the week is. They follow these groups just like people follow religion. They can do no wrong as long as they are committing an act in its name. Burning down a police station - fine it's for a good cause. Anyone who does not agree with you is a heathen, or a "nazi white supremacist" as they say. It's like the Spanish Inquisition all over again.

I doubt the "leaders" of those groups even realise this. First instill a set of beliefs, then get people to meet up and protest and riot (equivalent of having mass and praying), then on the side meet friends, have events and parties, all while creating a sense of community ONLY for those involved.

I myself am not religious but I was raised Catholic.