What you describe is not a basis for involuntary commitment. Furthermore, you could not do this anyway, based upon the few facts presented. You also do not have the authority to do it.
Pressuring someone to attend church is not unusual, and hardly a basis for commitment. You have no standing in the matter. Treated mental conditions are being treated, and so no basis for commitment. If you are in conflict, you are of an age when you can move out and move on.
We do not have a client/attorney relationship until you make an appointment, we discuss your case face to face, I accept a retainer, and we explictly agree to enter into representation.