Messianic Gentiles ( anyone who is not Jewish by birth or conversion) are those who have accepted Yeshua HaMashiach (Yeshua the Messiah) and want to be obedient to Him and the Tora. This group was originally defined and led by the Apostle Paul as the Apostle to the Gentiles.
And the dichotomy about the separation of Gentiles(including Christians) and Jews has been around since the beginning. So how does the Messianic Gentile fit in with the roots of Yeshua HaMashiach and Israel ? What is required of the Messianic Gentile to be grafted into the tree of Israel ? How does the Messianic Gentile worship in Messianic Judaism form without feeling that they have to become a Jew? The Epistle to the Galatians is a good place, yet difficult place, to start. Here Paul did his best to answer the question. Yet we will have to listen to Paul in early church Hebrew and Judaism and not current Western English. Take a moment to get your mind around the fact that Paul was Jewish and wrote in Eastern Jewish thinking and not Western Greek thinking. This is the foundation to understanding Paul's writings. Remember, even Peter stated in 2 Peter 3:16 that these matters were hard to understand.
11 Since everything is going to be destroyed like this, what kind of people should you be? You should lead holy and godly lives, 12 as you wait for the Day of God and work to hasten its coming. That Day will bring on the destruction of the heavens by fire, and the elements will melt from the heat; 13 but we, following along with his promise, wait for new heavens and a new earth,[b] in which righteousness will be at home. 14 Therefore, dear friends, as you look for these things, do everything you can to be found by him without spot or defect and at peace. 15 And think of our Lord’s patience as deliverance, just as our dear brother Sha’ul also wrote you, following the wisdom God gave him. 16 Indeed, he speaks about these things in all his letters. They contain some things that are hard to understand, things which the uninstructed and unstable distort, to their own destruction, as they do the other Scriptures.
Until next time, Shalom.