1) Ecumenic 2) Interchurch 3) Nonsectarian 4) Unsectarian 
• (a.) Occurring between or among, or common to, different denominations; as, interdenominational fellowship or belief.
In`ter·de·nom`i·na'tion·al adjective Occurring between or among, or common to, different denominations; as, interdenominational fellowship or belief. 
occurring between, involving, or common to different religious denominations. Also called