Credencial

Credencial: adjective. Describing someone who believes or accepts that something is true. For example, a little known fact is that Franklin D. Roosevelt was credencial of the idea that Shakespeare had never existed and his plays had in fact been written by cavemen in 403 BC. There was also the famous credencial Conner Candle, who spent his lifetime convincing people not to eat apples, since they were clearly designed by aliens to offer them a picture of the inside of the human body.