Muslims promote Sharia law. Why do Christians not promote their law?

His own followers.

Well. calling it "doing his PR for him" is pretty sophomoric but if stuff like that makes you feel better, go for it.

Well, not quite.Revelation (no 's') is a book written in the apocalyptic medium and format. It's also one of the books that many thought should not be included as canonical.The problem is that most folk are not taught about the apocalyptic tradition and literature and so don't understand that it was speaking not of some distant future but rather the immediate era concurrent to when it was written.

And the Bible also describes God as a loving father, a guardian shepherd, as a giver of life and comfort. Apocalyptic writings don't change the nature of God but they do portray how the author viewed his world where he saw God; as an avenger, a rescuer. Remember that Revelation speaks of an immediate future relative to the author, of things that would happen within the lifetime of the author; Revalation speaks of stuff that would be 1800 or so years in our past.Which God is described in any given book of the Bible is simply a record of how the author (or authors) of that particular work viewed God and their relationship to God and other men, nations and cultures.But what does any of that have to do with the topic anyway?

While the Declaration of Independence has historic significance related to the founding of the Nation State called the United States of America it has nothing to do with the laws of the US; and in fact Christianity was one of the greatest obstacles to creating that Nation State.The US has never been a Christian Nation thank God.