Pretty much. The entire bedrock to this country was built on judeo-christian influence, even though the founding fathers weren't really Christians, many of their influences were mostly Christian in one form or another.
The very first recorded laws with punishment against murder ever to exist are Babylonian in tablets called The Law Code of Hammurabi from 1780 B.C. Hammurabi was a 'god-fearing' prince, though the term 'god-fearing' doesnt quite mean the same thing, but the overall gist is that murder being 'bad' comes from (a) god. Those laws filtered down to the legal system we have today.
Ironically, pretty much every law in the Law Code of Hammurabi has the penalty of death.