Just a thought from a non-buddhist, if one is a buddhist, how can one's karate not be buddhist?
How is zen separate from karate? Or basket weaving, for that matter.
Also, why do you find it hard to believe that the Bhodidharma created sanchin? Personally I don't care who created it, but someone did. So who created sanchin, and why should I care?
If the patron saint of Chinese buddhism didn't create sanchin, does that make sanchin somehow less zen, or shall we say chan?
I find it hard to believe that Jesus Christ ever lived, but it doesn't seem to have any affect on the truth of what he taught.
What if the Buddha never existed? Would that have any impact on the validity of what he taught.
A rose is a rose is a rose.