Cal. Bus. & Prof. Code § 2800
None of the sections in this article, except Sections 2796 and 2797, shall be applicable to any person or persons specifically exempted from the general provisions of this act by Section 2731 hereof, or to schools conducted by any well-recognized church or denomination for the purpose of training the adherents of the church or denomination in the care of the sick in accordance with its religious tenets. An adherent of any well-recognized church or denomination who engages in nursing or the care of the sick in connection with the practice of the religious tenets of the well-recognized church or denomination may use the word "nurse" in connection with or following their name, provided they shall not use the title "registered nurse," the letters "R.N.," the words "graduate nurse," "trained nurse," "nurse anesthetist," or any other name, word, or symbol in connection with or following their name so as to lead another or others to believe that they are a professional nurse licensed under the provisions of this chapter.
Ca. Bus. and Prof. Code § 2800