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Schools are required to allow students to be released for religious programs. This does not mean schools do not have the ability to create policies that protect the school's instruction time.
Read more about "May" and "Shall" state laws

Full Law Text Link to State Law

(b) Each district school board, in accordance with rules of the State Board of Education, shall adopt policies authorizing a parent to request and be granted permission for absence of a student from school for:
1. Religious instruction or religious holidays.

Notes

(b) Each district school board, in accordance with rules of the State Board of Education, shall adopt policies authorizing a parent to request and be granted permission for absence of a student from school for: 1. Religious instruction or religious holidays.

All school districts, regardless of whether they are required by law to allow released time, should implement good policy and be prepared for when a released time program may approach the district. The time to set the policy is before an active program is pressuring the district. Research polices the district can implement to protect teachers' and students' instruction time. Set polices that limit disruptions to students and the ability for proselytization to occur, impacting other students of faith or no faith. A more detailed write-up on school board policies can be read here.