In your first statement you juxtapose QAnon vs Marx and Lenin (I presume you mean the bodies of political theory they propose), AND ... international conspiracy. Firstly, QAnon is entirely embracing of international conspiracies, embracing and reframing existing ones and generating new variations. Secondly, in the minds of "believers" who, I would hazard a guess, have not dived deeply into their team's canon - yes - they are effectively the same. A body of thought that drives particular fervently held beliefs and behaviours irrespective of the actual details. True believers don't care about details in the same way that fundamentalist christians don't care about biblical scholarship.
You are clearly wrong stating that nobody believes Trump is a true messiah. As evidence, I refer you to consider just a few of these videos. You won't have to scroll far. https://www.youtube.com/results?search_query=donald+trump+me...
As evidence that MAGA is considered as more than just a hat (by the MAGA equivalent of the intellectual elites and their readers), I offer "The MAGA Doctrine" by Charlie Kirk, which is clearly highly rated by the over 2000 people that bothered to rate it. https://www.amazon.com/exec/obidos/ASIN/0062974688/reasonmag...
You state that "MAGA folks just want to BBQ" as if Jan 6 never happened. Really? Can you really sustain the belief that those folks were all a bunch of pranksters and didn't come with a belief that they were going to change America?