at the risk of being called a reddit atheist, i have to say it's frustrating that this discourse keeps abstracted to 'is religion compatible with communist ideology' and not 'is being reactionary compatible with communist ideology'

because that's what it ultimately comes down to - a lot of the issues people have with religion stem from reactionary thinking and actions, which on a surface level seems like it can be separated from religion as a whole, but I would argue that the two functionally can not be unlinked. At the end of the day, at it's very core many religious beliefs rely on, and encourage, reactionary behaviour - and while some are better and more communal minded/liberation adjacent than others, I would say that this is by coincidence and we cannot make the mistake of trying to make reactionary ideologies 'work for us'. You need only look at stupidpol to see what happens when you throw people under the bus in order to not turn away what you might see as potential comrades - you will not drag them left with you, you'll only poison your own well and create yet another avenue for reactionary ideology to bolster itself.

This is not to say that no religious person can be a revolutionary, or that religious people cannot be our comrades - but they would have to be communist first and religious second or else I'd be wary that at some point some oppressed group is going to be thrown to the grinder, and I'll be honest - anecdotally, not a lot of religious people are like that, nor a lot of religions encourage such a relationship with their faith, no matter what denomination.