Further on red letter Christians and red letter bibles, see an earlier post here. I was reading the follow passage in a bible with red letters for the words of Jesus.
27 "Now my heart is troubled, and what shall I say?`Father, save me from this hour'? No, it was for this very reason I came to this hour. 28 Father, glorify your name!" Then a voice came from heaven, "I have glorified it, and will glorify it again." 29 The crowd that was there and heard it said it had thundered; others said an angel had spoken to him.
Whose voice speaks from heaven in v. 28? Presumably the same voice as spoke from heaven at the baptism of the Lord Jesus and at his transfiguration. The only voice that ever speaks from heaven is the voice of God.
Why do we colour the words of the Lord Jesus red but not the words of God? Are the words of the Lord Jesus better, more significant, more important than the words of God spoken from heaven?
It is a truly silly idea to have red letter bibles, and an even worse idea to claim to be a red letter Christian, privileging the words of the Lord Jesus recorded in Scripture over the word of God, which is the essential nature of Scripture.