ok, i'm going to put away my skeptic hat for a moment and put on my marxist cape.
i just think the marxist article of clothing should be a cape. it just makes sense, some how. i dunno. but it's obvious.
religion is supposed to be this thing that governments use to control masses of people into compliance with. so, it strikes me as kind of weird to speak of it in terms of resistance. now, i need to rip off my marxist cape because my paranoid anarchist heart wants to look for evidence of alliance with power structures, as that is, in truth, occam's razor. yet, the possibility of a simple slick preacher also always exists - and these aren't mutually exclusive.
at the least, any activist on the left should be particularly weary of any kind of religious movement trying to involve itself with politics. there is a 100% chance that they are trying to take over your movement for one nefarious aim or the other.
the problem that marx (where's my cape?...) saw with christianity is that it promises salvation in an afterlife, thereby leaving workers in delusional states of fantasies about life and death. i'm supposed to point out that marx saw this as an obstacle to movement building and leave it at that, but think about the psychology in what he's suggesting. think about how that breaks a human's soul into two, having them turn an active desire for death into a virtue. to convince humans that they should believe that all of the misery and all of the struggle is worth it because it will be paid off in an afterlife, which certainly doesn't exist. this is a truly dangerous cult.
i don't feel that buddhism escapes this general description of a pacifying force, but rather in a way just transcribes it. buddhism also teaches that life is meaningless, and that there is some preferable place in the hierarchy in the next life. this is incompatible with a revolutionary politic.