As it pertains to faith, a Jew/Christian is one inwardly.
Romans 2:28-29
For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: 29But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.
Those in Revelation 2:9, and Revelation 2:10 claim to be Jews but are not, and are just like those who Christ addressed in John 8.
John 8:42-44
Jesus said unto them, If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but He sent me. 43Why do ye not understand my speech? even because ye cannot hear my word. 44Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
Romans 2:28-29
For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: 29But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.
Those in Revelation 2:9, and Revelation 2:10 claim to be Jews but are not, and are just like those who Christ addressed in John 8.
John 8:42-44
Jesus said unto them, If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but He sent me. 43Why do ye not understand my speech? even because ye cannot hear my word. 44Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.