They may not call their personal faith a religion, but it is easy to identify what is important to them by asking three typically religious questions. The answers people give to these questions will give us a clue to their judgments about most questions of right and wrong. In the Epistle to the church in Colossae Paul is concerned that many in that church have been persuaded to change to another religion. And with that change their judgments about what is right and wrong are also changing. We should also note that every religion or ideology will have legalists who try to make their judgments of right and wrong into universal rules that are meant to be obeyed in all circumstances.
Legalism is very different from the voluntary adoption of rules for our particular purpose.
A woman who has freely chosen the challenge of mountain climbing knows there are rules to be learned and strictly obeyed. This is the way you knot the rope . . . Never put your weight on it till you have tested the anchor . In that sense every discipline that we adopt has its own rules. There are rules for cooking, piano playing, gardening, raising children, minding a pet, etc.