In Colossians who might have been cheating the Believers? In some cases it was those “Judaizers” who tried to make the Church Jewish. They tried to bring Christians back “under law” and thus not “under grace.” Since Christ had satisfied the law, and was “the end of the law for righteousness” (Rom. 10:4), a return to the law was a return to the flesh and thus “carnal” Christianity. It also might have been the “mystery religions” of the Roman Empire. These promoted a religion that allowed you to submit to the Emperor as God or Savior, but who also had their own liturgy and doctrine to follow. Most of them were wed to the Greek “Gnostic” philosophy that, among other things, claimed that in addition to Christ and the Bible you needed additional special knowledge (Grk. gnosis). I think you see all of this in Paul’s words in places like Col. 2:8,16-23.
It is no different today. Any religion that tells us there is a “law” by which we can be righteous and have a right standing before God, they also are trying to cheat us, to keep us from holding fast to Christ, our Head, from whom we receive all we need to grow into His likeness (cf. Col. 2:18-19). Paul illustrated this in the Ten Commandments which said, “Thou shalt not covet” (Ex. 20:17). I could quote the law every day, and it would not cure my covetousness. Only what I have in Christ can change my life. If I continue to commit this sin I have not forgotten the law; rather, I have forgotten who I am in Christ.
The problem is not just the “law of Moses.” Every religion calls people to a carnal (fleshly) approach to righteousness and a right standing before God. They all have laws/rules of some sort that are the key to fulfilling the demands of said religion. Hinduism has the Dharma, Islam the five Pillars, Catholicism has seven sacraments, Seventh Day Adventists these days mainly judge you “in food or in drink,” and in the mega-business called Latter Day Saints the top of nearly every list is that you pay the tithe. But hear this: any pastor who tells you that you can solve some deep moral issue by ABC or 12 steps or 10 laws is potentially setting you up for the frustration and failure of living in the flesh.
Before giving you specifics, you might consider me a hypocrite because I told you, from Romans 6, four words that are fundamental to sanctification. So let me remind you: what Paul did was to call you to live life the same way you received Christ. You received Christ by faith and faith must not be a work (Eph. 2:8-9). It is the absence of work. So what Paul said was: you KNOW this, so RECKON it to be true of who you are. As you laid aside your works to become a Christian, lay aside your works to live as a Christian: YIELD your body to Christ. Our good works are called “fruit” because they are the work of the Holy Spirit rather than the your work. In every other system you are called to do some work that will cause God to bless you or give you grace. In Christ you are called to faith whereby He produces the fruit of righteousness in our bodies.