Well, that’s one way of looking at it—that Obama is primarily a Marxist.
Another way is that he’s primarily a Muslim.
Yet another is that he identifies as a black bisexual.
It’s confusing, but all of these groups are co-travelers for now, co-operating in the denigration and plundering of the USA for their short-term relative advantage.
Fissures will appear later. For example, gays will not be happy under Sharia. Nor will fundamental Muslims be happy if Marxism ultimately gains the upper hand and institutes its own structures instead of Sharia. And so on...
I think the evidence of his Marxism is far weightier than any other competing theories for his mental framework. Google “Obama’s Marxism” and you’ll find far more convincing writer’s than me of underpinnings of his thought.