non-denominational
adjective /ˌnɒn dɪnɒmɪˈneɪʃənl/
/ˌnɑːn dɪnɑːmɪˈneɪʃənl/
(also nondenominational especially in North American English)
- open or acceptable to people of any religious group, especially any branch of the Christian Church
- a non-denominational memorial service