Just to pick nits, it was King James, not mad King George, although the symmetry would be interesting if it was. And most Christians use more modern translations these days.

However, to your question -- some religious people do in fact believe laws in America should follow their holy book. This desire for a quasi-theocracy is known variously as Christian Reconstructionism or Dominionism. There are many reasons why it's prevalent here in the US, not least, that Eisenhower unwisely advanced the notion in the early 1950s that a pillar of good citizenship was public peity. In theory, any sort of organized religion, but mostly it was a nudge-wink endorsement of white anglo-saxon protestantism. Evangelicals seized on this tacit endorsement and soon the typical conflation of god, jingoistic capitalism and guns was underway, Billy Graham was sucking up to one president after another, the National Prayer Breakfast came into being, etc.

By the 1980s you had the spectacle of Pat Robertson running for President, the rise of groups like Moral Majority, etc.

It all culminated in what we have today, with evangelicalism completely untethered from even pretending to have ethics or moral convictions that aren't for sale, with them fully embracing the situational ethics against which they formerly railed.

I still hold out hope that in Trumpism we have the highest lowest expression of these trends, and it represents the death throes of something that's just not sustainable. The problem is the great danger of us falling down some dystopian rabbit-hole, which could derail human progress for decades or even centuries. There are unfortuantely several plausible scenarios where that could happen. I am clinging to the several plausible scenarios where it wouldn't. Time will tell.