Is there a codified list of this “moral law”? And the authority that enforces it? There is only one law, the set of rules codified in the legal system. As the old saying goes: “Nullum crimen sine lege”. So to extend it into some nebulous “moral” law is just an exercise in rhetorics, to demonize those who do not agree with you.
Your definition of law needs working on.
Where are Newton’s rules of physics codified in this legal system? Are they not also rightly called laws? Law comes from many other sources than the codes used by secular governments, my friend. Nor necessarily, as with the laws of physics, does there need to be an ‘authority that enforces’ something for it to be law.
Besides which, where on earth do you think the legal code comes from in the first place? In a democracy, it comes from community (majority) consensus about what people agree is or is not wrong. Usually based on some moral principle.
That’s why in most countries physician assisted suicide is in fact contrary to the criminal code - Dr Kevorkian’s case amply proves that there is both ‘crimen’ and ‘lege’ in regards physician assisted suicide. The reason for the existence of the ‘lege’ and the ‘crimen’, of course, is that the majority of people execrate the behaviour.
Why then cannot something that a large number of people consider, for whatever reason, to be immoral, be described as a ‘moral law’? Doesn’t mean it is binding on everyone, any more than the criminal law of one country is binding on those who live in another.
After all, there is no criminal law against adultery, but most people agree it is morally wrong to break one’s marital vows. In fact within living memory this moral disapproval of adultery had legal ramifications - if proven adultery was grounds for divorce.
Yes, it is possible. So what? Just like there are Catholics who do not agree with the banning of artificial birth control.
ABC isn’t an issue in the definition of murder - no-one is killed by it for one thing. And yes, it is considered by a percentage (though not all) to be contrary to the moral law. You don’t make any relevant point with this comment though.