1 Cor 13:5:"Keep testing whether you are in the faith; keep proving what you yourselves are. Or do you not recognize that Jesus Christ is in union with you? Unless you are disapproved."
How can we do that? By ‘testing whether we are in the faith.’ To do that, we do well to ask ourselves: ‘Do I really believe that I am part of the only organization that Jehovah has approved to accomplish his will? Am I doing my utmost to preach and teach the good news of the Kingdom? Do my actions show that I truly believe that these are the last days and that the end of Satan’s rule is near? Do I have the same confidence in Jehovah and Jesus now that I had when I dedicated my life to Jehovah God?’ (Matt. 24:14; 2 Tim. 3:1; Heb. 3:14) Pondering the answers to such questions will help us to keep proving what we ourselves are
Why don't they read the whole verse ? If you have Jesus inside you are in the faith!!!