That is funny, my old Sifu used to call me the "sleeping dragon" because I was patient until pushed to far, and then all fury broke loose.
All these marshall arts are steeped in spirtuallism. The whole idea is to bring out the good inner self so that you may over come all things from what inner power you possess. God says I will transform you by the renewing of the mind by uniting your mind with the mind of Christ. A big difference. We as humans have nothing to offer God in of our selves but Jesus died on the cross to save us from ourselves and to by the Holy Spirit transform us into the likeness of God. The weakest of the marshall arts Yoga, also attemps to bring out that inner person so that we can do all things on our own. Marshall arts should be avoided at all costs.
Martial arts IS steeped in spiritualism, but so is almost every other practice. Thats Satans Grande plan. But the practice of honing your body for skill, reflex, hobby, or even martial purpose itself is by no means spiritualistic. Just like most things in this world, you need to eat the melon and spit out the seeds. Take the physical, practical, logical, scientific, and martial aspect of the art, and firmly resist anything that has a spiritual componant. However, I do not support competition fighting though. Or any competition sports. Ellen White made clear that Rivalry sports do not build a christian character. And logically, if one is to be honest with themselves, they would agree. We are here in this world to be an element that does not seek to oppose, but to help. Even if our help is a seeming opposition in secular eyes.
Anyone can train with martial arts. However, I would recommend staying away from the "belt mills" that hand them out without any skill or ability that matches in order to make money and make someone feel better about themselves. Traditionally, your first belt has to be earned, and that takes some serious work on technique until you get it right.