It depends what you mean by muslim. My take is that he a marxist first and then somewhat of a cultural muslim second. By cultural muslim I mean he identifies with muslims and supports them but has no interest in being a devout or even practicing muslim. He needs no God. He IS a God in his own eyes.
“....has no interest in being a devout or even practicing muslim.”
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Give him a second term in the WH and you’ll see the metamorphosis.
Right now he is in the taqqiya mode.
Is he a marxist? Absolutely. A "cultural moslem". I'll leave that up to you. He is sympathetic to moslem leaders, at the expense of Jews, the west, and the interests of the US.