Of course there is a secularist edge to the organization - that is the whole point of the organization. Religion (all religions) should have no part in science education. But all the same, no person of any religion should be excluded from NCSE, all are welcomed. But the whole point is science education should be completely independent to any religious beliefs. It is all about the science education.
I think your beef is that they consider ID some kind of religion hiding in disguise, which I don’t disagree with as ID is not really science. Yes, I am going to double down with them in 2016.