In fact, the whole concept of "Biblical Christianity" is preposterous. The Epistles were written to a Church already in existence, or to individual members thereof. They were written to Christians, whose faith could not possibly have been based on writings not yet written. Likewise the four Gospels ... the Gospel according to St. Luke and the Acts, like some of the Epistles, were addressed to an individual. The Apocalypse is comprehensible only in the context of an already existing (and sometimes thriving) Church.