Lynn,
Hebrew Roots is one of the two kinds of groups that call themselves Messianic.
Hebrew Roots are Armstrongite, British Israel Gentiles.
Messianic Jews are Hebrew Christians and they are ethnically Jewish.
Most Messianic Jewish congregations are affiliated with either American Board of Mission to the Jews or Chosen People; both of which are mainstream Christian mission boards which draw their support primarily from mainstream churches and denominations.