Where is the demarcation line between "legislating morality" and simply "legislating"? Murder is morally wrong, aren't laws against murder thus legislating m

Where is the demarcation line between "legislating morality" and simply "legislating"? Murder is morally wrong, aren't laws against murder thus legislating morality? I don't claim to know many christians, but the phrase "legislating morality" isn't in the common vernacular of those I know. They advocate for what they believe in, and advocate against that which they oppose, the same as anybody else.