I'm glad you admit that Deuteronomy 28 says nothing about rejecting the messiah and everything about deviating from the commandments of the Torah. It saves me from having to cite Biblical quotations. But what makes you think that the prophet foretold in Deuteronomy 18 is J*sus? The only reason you believe this means J*sus is that you are already a chr*stian! It is impossible to prove that J*sus is the messiah. The Catholics engage in intellectual gymnastics to do so (and fail) while Protestants, more honest, merely quote the "new testament" in big colored letters (forgetting that before you can prove anything by the "new testament" you must first prove its validity, which can't be done). You know, if I were a mormon I suppose I could post quotations from the "book of mormon" in huge type and splashy colors but that wouldn't mean anything unless the person I'm arguing with already accepts the authority of the "book of mormon." Similarly the "new testament" only proves things to people who already believe in it. In other words, there is absolutely no way to prove J*sus is the messiah independently of chr*stian belief itself--unless you want to invoke your feelings.
It is indeed a mitzvah to hearken to a genuine prophet. It is also a mitzvah to refuse to listen to any "prophet" who tries to get people to believe in a higher revelation than the Torah of Moses or to deviate from it--as a matter of fact, it is a mitzvah to put that "prophet" to death. While we're at it, have you ever read Deuteronomy 13?
Which of the prophets was like Moses? Only one!
There will never be a prophet like Moses. Moses was the Ultimate Prophet, the "father of all wise men," both those who came before, and those who come after. Any "prophet" who claims to have a greater authority than Moses is worthy of death. Even the Messiah will not supersede or change the Torah of Moses. That is how you tell the real Messiah from a false one. You insist that the verse is a prophecy of J*sus only because you already believe in him. The verse itself no more objectively refers to J*sus than it does to Joseph Smith.
* Jesus brings us out of Egypt (slavery to sin) * Jesus takes us through the Red Sea (Baptism) * Jesus guides us through the wilderness of life and teaches us that "man does not live by bread alone, but by every word that comes from the mouth of God" * Jesus brings us to the promised land, yet he himself does not go in but lays down his life for "our" sin...
Again, this typology is a valid argument only if one already accepts chr*stianity. Otherwise it is merely an unproven subjective assertion.