N0. Not everyone claiming to be a Christian is one. Only those who have been born again, no matter what their religious affiliation are saved.
Denominational affiliation, baptism, membership, participation, whatever, doe NOT save you. It might be useful in helping the believer mature in Christ, but does not save anyone.
Catholicism teaches the error of making the results of salvation a requirement for it.
How can you tell one from another?
All I’ve seen, is y’all slapping each other on the back with such proclamations as, “See you in the clouds”.