The syllables of the chant are in dedication and represent all the truth of the universe. Prayer to idols is condemned. We are not under the imaginary laws of karma, that one's life cannot be improved until he gets rid of the bad of previous lives. Like many religions, the NSB attempts to make up it's own reality and truth. Rather, it cuts people off from reality as they have no way to test it objectively.
Followers leave the world of objectivity for constant uncertainty.
The Creator gave us the sense to live by some absolutes. Nichiren Shoshu attacked Christianity, saying it is inferior. Doing so, he reduced his own logic to nonsense. Obviously, Nichiren Shoshu's followers do not understand Christianity. This makes it easy for them to reject Christ.