The fact that you a fellow communist (as I am.) Say that religion is an oppressive pack of lies and is best left in the dustbin of history
I don't think I said that was my position and still less that I think it's objectively true. I don't believe in God much nowadays, but it is possible for people to believe things that aren't true without being liars, and still more when we are dealing with something like religion.
Religion touches on a dimension of human experience rather different than the world as approached from a rational angle after all. "Not rational" does not necessarily equate to "bogus." There is a mythic side of human consciousness, clearly.
One thing that is a marker of modern fundamentalism--Muslim, Christian, Jewish, Vedic, whatever--is that people seem to have lost sight of the distinction between Mythos and Logos. To a Christian fundamentalist, Christianity can't be true unless the Bible is literally true. But many other people have been able to accommodate the idea that a myth that is not literally true nevertheless is saying something worthwhile. I had a nun in Catholic school suggest that "the Bible teaches how to go to heaven and not how the heavens go." There are layers and layers of this kind of nuance available. But one aspect of capitalist society is that it gives a really hard workout to develop scientific rationality and engineering competence--a massive reliance on Logos. And Mythos is pretty much left in the archives, gathering dust. Apologists for "Western Civilization" often pat it on the back for morality and ethics and so forth, but I think it is plain that what European civilization really excelled at was technology, and this relates to capitalist organization--capitalism means that the workplace becomes the owner of means of production's playground; before this productive activity was something that the oppressed workers pretty much worked out how to do by themselves, the overlords then just came and took a big tribute from the loot and rode off again. Capitalism involves the exploiter in the productive process, as director, and therefore engages all sorts of analytic energies that formerly were available only to waging war as a game. It was then I think the transformation to capitalism that elevated science up to the level of a separate discipline eventually branching into a whole family of them, and made engineering a respectable study and not just something dirty mechanics did. Fundamentalist religions then bring back a limited, one-sided view of human experience and attempt to encompass the basically mythic work of religion in that frame.
But meanwhile, starved or otherwise, the mythic aspect of the mind continues to exist and to shape our actions. This is why even if I were presented with final and undoubtable proof that God does not exist, and their is no mystical dimension to reality whatsoever, I still would not ever say "religion is just a bunch of lies." Religion, even if scientifically false, is an attempt to understand our lives from a mythic angle. Even if they are nothing but stories, these remain interesting stories worth telling and musing on.
As it happens, I have long ago lost any sense I could kid myself into believing in some kind of loving divinity that will make things all right for sure in the sweet bye and bye. But neither have I stumbled upon that disproof, that final stake in the heart of all hope, if that is what it is, that I might actually find God after all some day. There are as I said plenty of atheists who do take that next step and say "you know what, religion is actually a bad thing, it's no good, it is just a bunch of bloodsucking lies." Such talk was common in the 19th century by the way, not just among Marxists but pretty commonplace to the entire leftist tradition.
But that's not me, and my point is, being a Red does not (not the way I see it anyway) categorically demand one must denounce and revile religion. It certainly has been associated with lots of people who have in fact denounced and reviled religion, and these people very often have plain reasons one certainly has to respect for their sincerity to hold such strong views. But from where I stand, I don't see how a categorical rejection of any kind of belief in God is a logical requirement for accepting a Marxist analysis of how things work here on Earth and what to do about it. Certainly many orthodoxies have demanded on their side that the faithful must reject Marxism, but I notice a lot of people take orthodoxy with a grain of salt.