Why maintain the distinction of New Testament Believers?

Aside from of the book of Revelation, the New Testament does not make a distinction between a Messianic and Gentile Believer, which the apostle Paul was emphasizing to the Ephesian church (Eph 2:11-16)

However, close observation of Revelation indicates that there are subtle distinctions which should be recognized, because these distinctions may affect the interpretation of the passage such as:

Satan is seen persecuting "the woman who gave birth to the male child" (Rev 12:13) and "went off to make war with the rest of her children, who keep the commandments of God and hold to the testimony of Jesus" (Rev 12:17).

Coming from the 12 sons of Israel (Rev 7:3-8), the 144,000 bond servants are described as virgin Jewish men who "follow Jesus wherever He goes" and (Rev 14:3-5).

Observing subtle details is a matter of good Bible study practice.