You can describe something as nonsectarian if it's not connected or affiliated with any particular religious or political belief.

A college is nonsectarian if it isn't associated with a religion or church, and a Sunday school class that teaches all religions is also nonsectarian. Something that's sectarian follows the rules of a particular group or sect, and it's the Latin word secta that's at the root of both sectarian and nonsectarian. The literal meaning of secta is "a way or a road," and its figurative meaning is "a following, school of thought, or religious group."

Definitions of nonsectarian
  1. adjective
    not restricted to one sect or school or party
    “religious training in a nonsectarian atmosphere”
    nonsectarian colleges”
    synonyms: unsectarian
    ecumenic, ecumenical, oecumenic, oecumenical
    concerned with promoting unity among churches or religions
    interchurch, interdenominational
    occurring between or among or common to different churches or denominations
    not restricted to a particular religious denomination
    not bound or devoted to the promotion of a particular denomination
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    belonging to or characteristic of a sect
    adhering or confined to a particular sect or denomination
    rigidly adhering to a particular sect or its doctrines
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