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
  1. noun
    a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist)
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    type of:
    religious person
    a person who manifests devotion to a deity
  2. noun
    someone who is doubtful or noncommittal about something
    synonyms: doubter
  3. adjective
    of or pertaining to an agnostic or agnosticism
  4. adjective
    uncertain of all claims to knowledge
    synonyms: agnostical
    nescient, unbelieving
    holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible
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    possessing intellectual or esoteric knowledge of spiritual things
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