God wants us to honor our parents because the family is the basic building block of His Kingdom. God describes the Kingdom in family terms. He is the Father, Jesus is the Son, and the church is the Son's bride. We are called sons, daughters, and children of the Kingdom. We are created and being created as sons in His image. God also uses terms like "beget," "born," and "grow up."
Immediately after creating Adam and Eve and announcing He was creating them in His image (Genesis 1:26), God established the first institution: the family through marriage. The conclusion is inescapable. The family would play a major role in creating man in God's image. Regarding marriage, family, and divorce, Malachi 2:15 says:
But did He not make them one, having a remnant of the Spirit? And why one? He seeks godly offspring! Therefore take heed to your spirit, and let none deal treacherously with the wife of his youth.
The godly principles learned and the character built within the human family are, upon conversion, transferable into the spiritual family relationship in the Kingdom of God. Parents are His representatives, and we honor and revere the creative majesty and power of God when we keep this commandment. God expects whatever we learned from honoring our parents to transfer into our relationship with Him.