non-sectarian
Describes a stance, organization, or activity that does not belong to or favor any particular religious denomination or sect. Often used in contexts like 無宗派の墓地 (non-sectarian cemetery) or 無宗派の学校 (non-denominational school).
This cemetery is non-sectarian, so people of any religion can use it.
Compound of 無 (mu, 'without') + 宗派 (shūha, 'sect, denomination').