My 9yr old son take Kyoshinkai Karate. He does have to bow before going into the dojo, but this is not human worship, it is just an act of respect. The Masters always make this clear when a new student signs on. Karate principals are based on respect. I was always taught it was bad and involved demons while growing up a JW. It is not that way at all. My son can chop blocks & wood with his palm and demons are not involved!!
My dad is the PO of his cong. and surprising I wasn't counseled when I told them my son takes Karate. But then again, they probably figured it wouldn't do any good good!