Christianity could be a higher order way of organizing lives

[spoonitnow]

Well obviously, but the problem there is morality is subjective, while law is objective.

"Abortion is murder" is a statement of fact. Better would be "I think abortion is immoral" and you don't come across as a judgemental tosspot who just uses the most powerful language one can imagine in an effort to obtain moral high ground.

You don't have to think abortion is immoral for it to be murder, ie: you don't have to think murder is immoral.