If it was legal where they live, Christians would be executing people the same way ISIS is doing.
Ideologically there is no difference between the Quran and the Bible.
I guess "moderate" Christians ignore/justify Leviticus the same way the "moderate" Muslims ignore/justify the violent passages in the Quran.
You have not the faintest idea how some people here think. You probably heard of boxer and part-time senator Manny Pacquiao, right? This self-appointed Christian preacher is in favor of death penalty, even mentioning in an interview that there's nothing wrong with capital punishment because it was prescribed in the Bible. He even went so far as state that it's "just as easy as kicking a chair". (I remember he did apologize for that remark because of the outrage. Can't remember clearly cause I switch channels when I see his face.)
Thank goodness his views do not represent the view of most people here (well, can't say about Muslims, we don't know their opinion on this but it'll probably be similar to the Pakistani gov't). Many people here are in favor of returning capital punishment but almost never spoken about using it against blasphemers. Their concern is mostly crime and hope that reviving death penalty would act as deterrent.
But of course, once you unleash the genie... It'll take just a single nut to sit in the Palace and we could be hanging atheists. It would become more troubling should we become a federation. Not hard to imagine any resulting Muslim state to insist on death for blasphemy.