Most Christians I know are way more myopic than that.
There are many Christians, and the people you know are not an adequate random sample for statistical inference in general.
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.