Let's not confuse "Christian Origination" with "Christian Obligation". We all know about "Christian Origination": it's right there in Ephesians 2:8-9 KJV.
However, "Christian Obligation" is right there in verse 10, Luke 17:10 KJV, John 14:15 KJV, 1 John 2:3-4 KJV, too many to list. We are obligated to render "reasonable, unprofitable service" to God, which includes keeping the Ten Commandments...if you disagree, which ones are we at liberty to freely disregard?