unbelief

You can use the noun unbelief to talk about a lack of belief in something, like your unbelief, since childhood, in fairies.

When someone doesn't believe in something, that person has an unbelief. Most often, the term unbelief is used to talk specifically about religion. An atheist is characterized by her unbelief in a god or higher power beyond things that can be scientifically proven. Another word for unbelief is disbelief.

Definitions of unbelief
1

n a rejection of belief

Synonyms:
disbelief
Antonyms:
belief
any cognitive content held as true
Types:
agnosticism, scepticism, skepticism
the disbelief in any claims of ultimate knowledge
atheism
a lack of belief in the existence of God or gods
Type of:
cognitive content, content, mental object
the sum or range of what has been perceived, discovered, or learned

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