I've had limited experience with a Messianic congregation, but have never had anyone who attended it not claim Jesus Christ as Lord and Savior. IMO, whether its Hebrew Roots or something else we must be discerning. Anytime anyone wants/tries to require something or put something between me and Jesus, that is a red flag for me. I do like to learn about the Hebrew culture during and before Jesus' time as it seems to expand my knowledge and understanding, but doesn't change what I already know to be truth.
Ph 3:15 (paraphrased):...And if on some point you and I think differently, that too God will make clear to us. Only let us live up to what we have already attained.