100% true but I used atheism to make a point. Substitute it with Satanism, even. (Not nearly as good of a parallel.)
Also, many of the atheists I know are ten times more obnoxious in preaching their views than most of the Christians I know so I would expect a niche for it to exist.
I suspect that those particular atheists are far fewer in number than that of evangelical Christians. Unless they're all in one place, video training aside, they'd be a difficult group to market to. As I said, most atheists don't look for 'atheists themed' businesses, and there doesn't appear to be a visible subculture of them that does.
Same would go for satanists. Generally, satanism is looked down upon by most everyone, not just those within Christianity, and I would bet that there are many more atheists than satanists. So unless you have a large concentration of satanists in one place, video training aside, it would be very difficult to market to them. Satanists don't look for satan themed businesses because I suspect that they know that the search will be mostly fruitless, as satanists compose a much smaller group than do atheists.
On the other hand, there is a very large subculture of Christianity that seeks out Christian themed businesses either exclusively or as often as possible, in addition to 'Christian themed' giving warm fuzzies to many Christians that are otherwise unconcerned about such things.
Most "Christian" themed businesses are themed in order to attract Christians, not in order to spread the gospel to non-Christians. And most Christians who go to a Christian MA school are doing so in order to practice in what they consider a safe haven.
As for the school changing after the fact, I just accept that all businesses change after the fact. Either you accept the change or go elsewhere. Sears Roebuck was a watch repair shop. They changed into a department store and eventually dropped watch repair and Roebuck's name. People went elsewhere for watch repair and either continued to patronize the store for the goods that it continued to offer or ceased to patronize it.
Most electronic goods were made in the US many years ago. American electronics companies changed the nation of origin of their goods after the fact and without sending out a huge announcment to forwarn their customers.
Businesses change. Nobody thinks anything of it unless the change involves religion, which is silly. LIke the change or don't care about the change? Keep patronizing them. Don't like the change? Stop patronizing them. Its as simple as that.
The whole 'religion belongs/does not belong in martial arts' is a matter of opinion. Martial arts are physical skills. If you think of them as more than that, then that is fine and should train in a school that reflects that. But there is no rule that requires nor prevents religion from being attached to the practice of those physical skills. Nor is there a rule that allows for only Asian philosophy and religion to be attached to them.
Physical skills. Teach them in the way that you see fit. Just understand that you may limit both your clientelle and the places that will want you to teach for them if you theme your classes according to a specific religion.
If my classes are themed toward simply teaching hapkido, I can teach it at Church, in the public schools, at the community college, at the Christian school, at the Jewish Community Center, at the Islamic Center, at the YMCA, out of my backyard, at Bally's, or in retail space.
If I make it a point to teach
Christian hapkido, I have limited myself to Church, the Christian school, possibly the YMCA, my backyard, and retail space.
Daniel