agnostic

nouns

someone who is doubtful or noncommittal about something
agnostic, doubter
is derived from
agnostical
a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist)
agnostic
is derived from
agnostical
is a type of (narrower)
a person who manifests devotion to a deity
religious person

adjectives

of or pertaining to an agnostic or agnosticism
agnostic
pertains to
agnosticism
uncertain of all claims to knowledge
agnostic, agnostical
antonym
gnostic