You are spot on! neither to add  nor subtract. Deuteronomy 4:2 (this in reference to the Commandments), Revelation 22:18. the point is clear: to mess with the Word (and this to me would apply malefic intent, intent to manipulate, intended wrongful division of the Word) you gonna get your butt beat by God. He will not tolerate abuse of His Word, which in turn abuses people. We have seen plenty of it for selfish gain.