If Putin has stopped killing people, and confessed Jesus Christ is Lord, why can’t he be a Christian?
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Because merely stopped killing people politically (which is VERY doubtful) and merely confessing Jesus Christ is Lord in ritual does not mean one is a Biblical Christian, whom he actually opposes, and is more like .
Diotrephes, who loveth to have the preeminence among them, receiveth us not. (3 John 9)