The noun credulity means willingness to accept that something is real or true, particularly when this is unbelievable.

Synonyms are belief, conviction, faith, or hope.

The word origins from Old French (15th century) credulité meaning “faith, belief” and from Latin credulitatem meaning “easiness of belief, rash confidence,” noun of quality from credulus meaning “that easily believes, trustful”, from credere meaning “to believe”. The meaning “a weak or ignorant disregard of the importance of evidence, a disposition too ready to believe” especially absurd or impossible things, is from the 1540s.

Credulity of children will put them at risk.

For this reason it would seem to be simple credulity.

Interest and credulity are the nature of crude judgement.