 Despite these differences, Christians generally agree that faith in Jesus lies at the core of the Christian tradition, and that such faith is required in order to be a Christian.The word "faith", translated from the Greek "πιστις" ("pi'stis"), was primarily used in the New Testament with the Greek perfect tense and translates as a noun-verb hybrid; which is not adequately conveyed by the English noun.The verb form of "pi'stis" is "pisteuo", which is often translated into English versions of the New Testament as 'believe'.