Is it permissible to bow to greet a Muslim or a non-Muslim?

Q 3: We joined a karate club in America. The coach said: "You should bow when your opponent bows to you". We refused and explained that this is against our religion. He agreed but said: "You should only gesture by your heads, for an opponent initiates a greeting by bowing and you should greet him back". What is your opinion on this?

A: It's not permissible to bow to greet a Muslim or a non-Muslim whether by the upper part of the body or with the head, because bowing is a religious act of `Ibadah (worship) and `Ibadah (Part No. 1; Page No. 234) should be devoted to Allah Alone.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.