We legislate morality all the time. It is immoral to steal and rape and murder and any number of things.
So, outlawing blasphemy is constitutional?
Ya. Following the 10 Commandments is a pretty good thing. Murder — bad, adultery — bad, etc. etc.
Hopefully, they are suggesting that it should be okay to murder, etc.
I guess the question is; "how Biblical is it?" Some folks' "morality" is based on inner opinions (Baptists against drinking/dancing/singing to the radio). Most laws deal with some sort of morality and even the 10 Commandments, but many have nothing whatever to do with morality unless one considers speeding to be immoral. Since Roe vs. Wade, and homosexual "marriage", and many other social "new norms", legislating morality is more a concept and we are getting into true New Covenant territory where God will be the Judge and man-made laws are inconsequential to the really big picture.