I would argue that it's religious in background. That doesn't mean it's still religious. Much of the "secular" side of Christmas is a hold-over from pagan traditions of the Yule. It's not religious anymore for most people (I certainly have no religious connection to a Christmas tree), though that's where it came from.Yeah, I get that you don't get it... that's apparent in your mis-grasp of my comments.
No, I mentioned nothing about what karate is, I was talking about Japanese arts in general (including karate, of course). Secondly, have you ever encountered the phrase "Karate (or Budo, or any activity specified by the context, actually) begins and ends with rei (bowing, etiquette, ritual etc)" (Rei ni hajimari, rei ni owaru - 礼に始まり礼に終わる)? That kinda talks specifically to the concept, you know... as it's not really saying what is commonly thought, that it all begins and ends with respect (to each other), but that each training session begins and ends with an acknowledgement of the previous generations, the particular guardian deities associated with the art and dojo, and so on... in other words, with a ritual based in Shinto beliefs and thoughts.
So, what I was saying was that to participate in a Japanese martial art without acknowledging the reality that much of what you're doing is, indeed, religious in base, intent, and even deed, is to miss so much of the point and reality of what you're doing that it's like thinking tennis is just the hitting of a ball with a racquet. Perhaps it makes more sense to you to say that it's like tennis without the scoring, then? The actions are ostensibly the same, as are the surrounds, but there's really none of the point (of course, by simply keeping the surrounds the same in a martial art, you're now already in a religious building/environment... hence my removal of the lines of the court in the first case).