One should very carefully inquire into the SGI, Nichiren Shoshu, and Nichikan teachings

“Again, in the Nirvana Sutra the Buddha says, `When my teachings are transmitted to other countries, many errors are bound to be introduced.’ Even if among sutra passages we were to find the Lotus Sutra characterized as useless or Shakyamuni Buddha described as a Buddha who was lost in a realm of darkness, we should inquire very carefully to see whether the text that makes such statements belongs to the provisional or the true teaching, to the Mahayana or the Hinayana, whether it was preached in the earlier or the later part of the Buddha’s life, and who the translator was.” — Nichiren Daishonin