Sec. 17. (a) Except:
(1) as otherwise agreed by the parties in writing at the time of the custody order; and
(2) as provided in subsection (b);
the custodian may determine the child's upbringing, including the child's education, health care, and religious training.
(b) If the court finds after motion by a noncustodial parent that, in the absence of a specific limitation of the custodian's authority, the child's:
(1) physical health would be endangered; or
(2) emotional development would be significantly impaired;
the court may specifically limit the custodian's authority.