All the rest is finding culturally appropriate forms that best express the content we bring. Muslims do the same thing in a certain way. That last sentence is not complete. I suppose it is a question or a suggestion to think about. There are no rules he gives.
Christians are different.
I do prostrate ever so often, but not as a rule. He may, but I think that is a rather strange point. Any bodily direction is fine as long as the direction of the heart is right. Praying to Jerusalem is certainly okay, but any other direction is just as okay. If it helps anybody to direct the body to a regular direction, go for it.