Ind. Code § 20-33-12-2

Sec. 2. A public school shall not discriminate against a student or a student's parent on the basis of a religious viewpoint or religious expression. A public school shall treat a student's voluntary expression of a religious viewpoint, if any, on an otherwise permissible subject in the same manner the public school treats a student's voluntary expression of a secular or other viewpoint on an otherwise permissible subject and may not discriminate against the student based on a religious viewpoint expressed by the student on an otherwise permissible subject.