That is a very specific question to me, regarding occupation, either for pay or volunteer. If someone responded with, "I read the bible" I'd think them to be sanctimonious. If they said instead, 'I read the bible and write bible studies" then it would be different. Because to me having an occupation (paying or not) is about serving others. The only exception is if a person is a student, and in that case, they are generally studying to be in a position later to have an occupation and serve others with skill.
On other occasions, I am asking what are their hobbies - which could include reading the bible. In those cases, I generally phrase it as, "what do you do for fun".