‘Whole Bible Christianity’ chapter 2 summary.
Sin is turning from His Word. Disobedience. Not abiding. It separates us from Him because it is opposite of His holiness and love. Every time we choose self-will over His will we cheat on God, whether we have a statue in the living room or pick the fruit of our own knowledge tree. We may make the cheating more palatable by mixing it with some of His truth, but lukewarm action is rejected by God. His grace is meant to lead us to repentance, not give space for us to cheapen it with more disobedience. His unconditional love does not allow sin.
At this point in history the whole truth is we ought to fear and submit to Him who has shown His absolute power, and who can destroy body and soul in hell. Believers worship Him by obedience to all of His commands, in spirit and in truth, humbly thankful for the riches of His grace and mercy in providing for our salvation. We can split hairs all we want about His nature and position or names and titles, but the plain meaning of the Word is clear, if we choose to read it and heed it.