Was Paul a gentile? Wasn't Paul apart of the Church?
Church does not equal salvation! If that were case then no one could be saved prior to the building of the church.
Paul was saved as a Jew and then added to the church as were the 3000 on the day of Pentecost. You cannot "add" to something that does not already exist. The church existed prior to Pentecost and was built out of the materials provided by John the Baptist (Lk. 1:17; Jn. 1:29-35) and was assembling with ordinances prior to Acts 2 as well as with officers (Mk. 3:12; Lk. 6:12; Acts 1:21-22; 1 Cor. 12:18).
The church is the public institution of worship that can be found throughout the New Testament in all geographical locations where people were first saved and then baptized and assembled into that church institution.
The church and Israel are not one and the same in any way shape or form.
You could not find the term "church" in the greatest treatise on the promises and future salvation of Israel because they are not one and the same.