Bowing the knee in the bible is the expression of worship. Daniel got in trouble for not doing it. When I see people face down prostrated, or bowing on one or two knees, (to rioters) it seems disgusting.
Perhaps Christian groups could make some display of bowing the knee to God alone. (at police stations, monuments, or wherever)
This is correct. One Greek word usually translated "worship" is
proskuneo, which does mean to kneel.
In Japan there is the standing bow which is normal, but then the seated bow, called the
zarei. It is done when both are seated. However, once in Shikoku, as another missionary and I were leaving the house, an old lady did a
zarei to us as we were standing, and said, "You are like gods." We immediately corrected her, of course, but there you have it. To kneel to someone who is standing in Japan is usually to worship them. To kneel to another standing human being in American culture is just too much like worship.