You are definitely correct that there is not much communication going on, let alone productive. But another reason for that this is an awkward and difficult conversation to be had as Marxism and Islam are ideologically contradictory is a very strong, formal sense. Obviously this is most immediately an abstract, theoretical point, though that is not irrelevant, as moving through differences and formal contradictions towards consistency is necessary for moving towards truth, and truth is not irrelevant to politics, especially Marxist politics. There is also the issue of the political history of Islam, which is not very progressive and has become less so in the modern era imo. The contradiction between them is also not only something perceived by Marxists, but is very much clear to Muslims as well. An issue that Marxist militants ALWAYS have in my experience in situations like this is that if you are talking politics, or trying to agitate or organize, and you are doing so with religious individuals, especially if they are radicalizing and becoming interested in Marxism, is the contradiction they clearly perceive between their religious convictions and their developing Marxist/Communist political beliefs. At a point if you are in a party you do have to have the conversation with potential militants or members that Marxism is not compatible with the liberal position on religion of pretending like it is politically irrelevant, simply to appeal to the insecurity or narcissism of particular individuals who want to have their cake and eat it too. It is completely incompatible with the Leninist conception of the party.

It shouldn't be surprising that Marxists are not, in general, going to be attracted to a religion which not only explicitly states that they deserve to be and will be burned and unimaginably tortured in hell for eternity, whose metaphysics is clearly incompatible, but more importantly from it's inception to the current day has proscribed very different political structures and relations than Marxism (again, not a surprise, given that it emerged in Arabia in the 7th century CE, and that it's founder was not only a political and religious leader but a warlord who seems to have committed war crimes and whose values were profoundly different to those of modern socialism).

It's not a coincidence that the modern radical and dynamic expressions of political energy in the Islamic world of the modern era have been Islamist, and that Islamists immediately crush any progressive forces when they come confidently into power. Every place they have come to power they have enacted absolutely depraved social policies. The success of Islamism in the modern era is not only an expression of the religiosity of these societies and the effects of Imperialism and Colonialism, but also an expression of the failures of progressive forces, i.e. communists and socialists in these societies.

Honestly a consequence of this is that individuals then often end up taking pretty simplistic or nationalist positions in relation to certain political struggles, because there is also a reticence among many people of the left to recognize out the self-evidently reactionary aspects of certain movements which stem directly from their religious, theocratic ideologies, as well as broader material conditions, due to the risk that that will be perceived as an attack of the downtrodden. It's a bizarrely moralistic, un-Marxist, and frankly moronic position to take, because more fundamentally its a question of being realistic about the political possibilities available to movements which are not driven ideologically by socialist or communist ideology, which I think worsens alot of the analysis you see on these problems.