What is the ruling of the Sharia on the salutation of the hall in Judo when prostrating?

The "salute to the hall" in Judo, which involves bowing to the point of genuflection, is impermissible for two reasons: First, it entails bowing to other than Allah. Second, it alludes to religious rituals and beliefs. If one can learn the game without this salute, there is no harm. However, if it is an inseparable part of it, then participation is not permissible.