gobrit, the argument at this point is not so much if the Rebbe is moshiach. If only the moshiach aspect would be the case no would care this much. The bigger issue is the worship of their rebbe. Would you be OK with Christian communities living amongst us, dressed as Chareidim, feeling like they are Chareidim, mingling with us? Would their hechsheirim be accepted as kosher? Would people buy from their sofrim? Would they daven in their sohuls? The early Christians were “frum” Jews, so this scenerio was the reality 2,000 years ago.
The bigger problem is not Chabad meshiachistens insistence that their dead rebbe is moshiach, that is the source of the problem but not the extent of the problem. The bigger problem is that Chabiadinity is not Judaism. It is a seperate religion of kofrim who believe the Rebbe runs the world, the Rebbe is everywhere, that one should pray to him, that he knows everything, that he never made mistakes and thar he is alive in a physical sense. The is a”z mamesh. That we have people from this religion giving hechsheirim and providing food, having minyanim all over the world where Jewish travelers daven and provide services and mingling with us is a huge, huge problem as well as a chillul shem shomayim.
