Although a Messianic may start out believing that he is saved by faith and not by works, he can get so absorbed in the minutae of Torah that he soon loses sight of his first love, the Messiah (Christ), even though he may refer to Him by name often.
The Bible teaches that we are saved by faith not by works (Eph.2:8). If we try to get right with Yahweh by observing Torah we have failed even before we have started. It simply isn't possible. Only the Messiah (Christ) has ever accomplished this, and for the redemption of our souls.
Works are the fruits of salvation, the evidence that we are saved, and the proof that we truly love Eloah (God) and care about our fellow man. They are not that which make us right with Him. In that respect the Protestants are 100% correct. We are saved by grace alone.
Some Messianics add a devious twist to this important principle. They say that observing Torah requires faith, and it is that faith which saves.
They could not be more fatally wrong. Saving faith is that which places complete reliance on the Messiah (Christ) for everything what we are, believe or do. It is quite simply yielding ourselves to Him as to God (Eloah). But then that's one of the big stumbling blocks of some Messianics - they don't believe that the Messiah is truly God (Eloah) and that immediately places them outside the pale of saving faith and into the same kind of cultism as the Jehovah's Witnesses and others of their ilk who deny the divinity of the Messiah (Christ).