[TaraP]

Well then what was Jesus’s Mother? what about Mary of Magdela? What about the Jews in Corinth?

What about the Jews who did not accept Pauls’ or Constatines teachings?

The Jews who knew and accepted Jesus in Israel as the Chosen, the Messiah still adhered to Jewish Laws and Customs.

[ChicagoHebrew]

If you are referring to the original Ebionite community, then I wouldn’t call them Christians. They accepted Jesus as a prophet, but rejected his divinity, rejected pagan innovations such as the virgin birth or the trinity, and believed that God required obedience to the law — not merely vicarious fulfillment of the law through some dead Jew who got hung on a tree.

[Lee N. Field]

But they weren't Gentiles deliberately putting themselves under the Law thinking it would make them a better class of Christians.

Read Galatians.