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John did not call Yeshua “Jesus Christ,” the Greek translators did.
I recognize the one that the apostles did.
We have to live as he did to claim that we believe in him; otherwise we are as John stated “liars” and the truth is not in us.
Again, how do you define sin?
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Your argument is with the Spirit who moved John, and the other writers of the NT, to call Jesus the Christ.