>>No<<
Then the true church, the body of Christ, is not only the RCC?
The fullness of Truth as revealed by God to the Jews and by Jesus to the first believers and by the Holy Spirit to the Church is proclaimed, preserved and defended by the Catholic Church.
All who are baptized in the name of the Father, the Son and the Holy Spirit are members of the Church, though some not may be in perfect communion with her.
One note here....
When I say belong, I mean one who attends Mass and accepts the teachings. So, while one may “belong” in spirit through baptism, one may not “belong” in practice.