It would be a shame to over associate Rastafari with Jamaican music, or even just reggae, with it.

That would be like thinking of American music in terms of New Age hippies. There was a period when Rastas got a high profile in Jamaican music. Like there was a hippie era in American rock. So happens that the slice of Jamaican artists that got marketed to / picked up by people outside Jamaica were in the Rasta trend, and the people who picked it up were, sorta, hippies. Selection/confirmation bias. What they did in producing and marketing the Wailers to the aesthetics of Anglo/White rock fans is well known.

The irony in the Jamaican story is that Rasta developed as an intended Afrocentric philosophy, but it looked abroad to EAST Africa (not the ancestral home of Black Jamaicans) and to Christianity. Whereas right there in Jamaica were religions of West and Central Africa that people had maintained. "Kumina" was a big one, brought by people from Congo who were never enslaved. But Rastas were *actively* at odds with these African religions, considering them sinful. They were also at odds with the Black Jamaicans who sought empowerment through Islam (in the Malcolm X vein).

Black people in Jamaica had succeeded in getting an independent "Black" majority country, with also room to be a multicultural nation. (The motto of JA is "Out of Many, One.") It wasn't like minority Black people in the US in Garvey's day, who had the idea of escaping white supremacy by leaving the country. Black Jamaicans had their country, and a newly forged Black identity of the new world, forming coalitions of Caribbean nations that knew their worth as Black people.
Then the Rastas come and bring this regressive form of fire and brimstone Christianity and bizarre reverence for a very dubious leader. It's like college kids when they get into some "revolutionary" stuff, fight the system, though it's all ideas they got from their professors (the system) and comes from French and German philosophers. A lot of projecting: Telling others to become decolonized, while who could be more colonized mentally than them and their Bibles? Of course the figurehead would be Bob Marley, a biracial guy with connections, who would feel the need to overcompensate when seeking "Africa" -- rather than, say, the Maroon people in Jamaica who effectively beat their colonial masters and had kept going with Ghanaian style customs and language.

I'm speaking to the anti-colonial / pro-African aspect of Rastafari that people would try to say justifies it despite its poor values and plain weirdness. It's as if people assume "those poor jamaicans, poor Black people -- good for them in coming up with a powerful philosophy" -- whereas the reality was that Jamaicans already had strong movements and didn't need a literal interpretation of the Bible!