I agree with you. I think we have already had some stunning examples of how crafty and ruthless he is.
As for his believing what he is saying, I think it depends on what he is saying to what audience. What he really believes is radical left-wing insanity, racially driven, and probably with a serious tinge of Islam that he doesn't dare be open about (associating with NOI types is about as far as he dares to go). But what he really, really believes, more than anything else, is that he deserves power. He is completely driven by the desire for power.
And that is something to be underestimated at our own peril.