At its most basic, it's "Do No Harm" and "Do Unto Others As You Would Have Done Unto You" - which are of course the very reasons the law even exists.
Where did your 'precepts' come from?
I have no problem telling people that they are wrong when they are wrong. Your particular moral precept is less important (to use your terminology) foremost because it is wrong. There are other reasons, of course, (because it is immoral - see the first part of this comment - and because it is based on myth) but that's the primary reason.
So the Catholic Faith is WRONG? It is 'immoral'? It is based on 'myth'? Really? According to who? You? What is your AUTHORITY for such a sweeping claim?
If I did not think your moral precept was wrong then we would obviously not even be having this debate. BTW, the reason why we live in a secular nation is so that people with one belief system, such as myself, need not tell people of another belief system, such as yourself, just how wrong they are. That prevents a great deal of acrimony and sooner or later that route results in people getting killed.
You DO tell me that my moral precepts are "wrong" though. Who gives you that authority and what 'moral precepts' are you using as your guide and claiming as "right"?
Those are rather existential precepts. They are an assertion of the actual state of being.
So the Catholic Faith is WRONG? It is 'immoral'? It is based on 'myth'? Really? According to who? You? What is your AUTHORITY for such a sweeping claim?
Yes, yes, yes, and yes. According to five billion people, including myself. Those five billion follow a myriad of authorities, feel free to select one.
As for my own, it is wrong simply because it does not correctly describe reality. It is immoral because it violates the two moral precepts that I have specified. It is based on myth because it is predicated upon fictitious parables.
You DO tell me that my moral precepts are "wrong" though. Who gives you that authority and what 'moral precepts' are you using as your guide and claiming as "right"?
You asked, dear, and so I answered. It would have been impolite and uncivil of me to ignore you. In a secular nation your question was of course unnecessary to the question at hand (the formulation of the laws) and so if you had chosen not to ask I would not need have answered.