Cred"u*lous*ly, adv. With credulity.
Cred"u*lous*ness, n. Readiness to believe on slight evidence; credulity.
Beyond all credulity is the credulousness of atheists.
S. Clarke.
Creed (krēd), n. [OE. credo, crede, AS. creda, fr. L. credo I believe, at the beginning of the Apostles' creed, fr. credere to believe; akin to OIr. cretim I believe, and Skr. šraddadhāmi; šrat trust + dhā to put. See Do, v. t., and cf. Credo, Grant.] 1. A definite summary of what is believed; esp., a summary of the articles of Christian faith; a confession of faith for public use; esp., one which is brief and comprehensive.
In the Protestant system the creed is not co÷rdinate with, but always subordinate to, the Bible.
Schaff-Herzog Encyc.