April 3

…the admission of children of non-Bahá’í parents to the school for Bahá’í children is permissible. And if, in this school, an outline of the fundamental principles underlying all religions be set forth for the information of the children, it can do no harm. 
- ‘Abdu’l-Baha  (‘Selections from the Writings of ‘Abdu’l-Baha’)