Believer is used generically of those in Messianic circles, as well as those in traditional churches who truly believe in Yeshua and seek to follow Him. By using the term believer, the focus is on a person's commitment to follow the Lord and not on the excess baggage of those who called themselves Christians but did not walk as He walked. This term refers to believers involved in Messianic congregations, Jewish or Gentile. Messianic refers to that expression of the biblical faith which expresses itself in a Jewish manner. Congregation Messianic congregations are not called churches.
Churches are associate with anti-Semitism Jewish people.
In the past, and in some places today, by Jewish has come from those who profess to be believers, both from clergy and laity. Ecclesia refers to people and not to buildings. The term congregation has the same reference point. There, it points to a meeting of believers. For this reason, the term congregation, or even synagogue, is the most appropriate one to describe organized gatherings of Messianic believers.