Amma ba'd
Permanent Committee for Research and Verdicts:
quote:
To greet somebody by bowing is unlawful, regardless whether that person is a Muslim or a disbeliever, and regardless whether you bow with your entire upper body or with your head only. This is because bowing is a kind of worship, and worship is for Allaah Almighty alone. May Allaah send peace and blessing upon Muhammad, his family, and his Companions.
Bowing as a Greeting Either in Karate or for Some Other Reason
Subhanak Allaahuma wa bihamdika ash-hadu anlaa illaaha illa anta astaghfiruka wa atubu ilayk
If I said anything correct, then it is from Allaah (subhanahu wa taa'ala), and if I erred, then that is from me and shaytan.