If someone believes they cannot know whether or not God exists, that person is an agnostic. Your grandmother might be a devout believer, while your mom is agnostic.

In 1869, English biologist T.H. Huxley coined this noun referring to someone whose religious beliefs lie somewhere in between those of a theist and an atheist — that is, a believer and a disbeliever. Huxley combined the Greek prefix a-, meaning "not," with gnostos, "known." This word can be used as a noun or adjective, and it can also refer to uncertainty about questions other than the existence of God: "Some philosophers remain agnostic as to whether people have free will."

Definitions of agnostic

n a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist)

Type of:
religious person
a person who manifests devotion to a deity

n someone who is doubtful or noncommittal about something

Type of:
individual, mortal, person, somebody, someone, soul
a human being

adj of or pertaining to an agnostic or agnosticism

adj uncertain of all claims to knowledge

nescient, unbelieving
holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible
possessing intellectual or esoteric knowledge of spiritual things

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