We are warned about adding to or taking away from the word of God. God's word is of uttermost importance to Him and it should be to us.
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"For the name of God is blasphemed among the Gentiles through you, as it is written."
R 2:24 KJV
"and my name continually every day is blasphemed."
Is 52:6 KJV
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The situation is not so black and white as you try to teach (the perfect KJV and everything else is bad).