I think that, these days, many people are at least passingly acquainted with the idea that the holy grail is the supposed bloodline of Jesus Christ, rather than an cup from the Last Supper. After the book "Holy Blood, Holy Grail" in the 80's and the way cable TV and talk radio have hashed and rehashed this, plus a gazillion websites that discuss the idea, it really isn't much of a "secret" anymore.
As for the occult toys, I've no doubt that the Nazis made use of them, as propaganda if nothing else. What surprises me is the number of members here who seemingly place stock in such nonsense.