看一看Bible是怎么看待下跪的：对别人下跪，不是基督徒的文化习惯，所以根本不可能是美国的文化习惯。

https://laymansbible.wordpress.com/2015/04/25/the-significance-of-kneeling/

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Another note before wrap up: don’t kneel to others. The most common example of this happening is when people beg. The posture for begging is the same position as prayer; hands folded, on your knees. When you beg somebody on your knees, it is like that person becomes God. Of course, this isn’t really a big deal in the US anymore because most of us are too arrogant to actually beg, but I’ve noticed it still comes up a lot in Korean media and is fairly heavily ingrained into their culture. There are some examples in the Bible of people trying to kneel before others and being rebuked for doing so. Like when Cornelius tried to bow to Peter: “As Peter entered the house, Cornelius met him and fell at his feet in reverence. But Peter made him get up. ‘Stand up,’ he said, ‘I am only a man myself’” (Acts 10:25-26). You shouldn’t kneel down to others’ god’s either, even if you’re trying to be respectful of their beliefs; for it is written,

My angel will go ahead of you and bring you into the land of the Amorites, Hittites, Perizzites, Canaanites, Hivites and Jebusites, and I will wipe them out. Do not bow down before their gods or worship them or follow their practices. You must demolish them and break their sacred stones to pieces (Exodus 23:23-24).