Actually, it's not even certain they had that. Much of the gospels seem to have been written after Paul's influence was widespread, and he's the only person historians seem certain was writing of his own experiences. The gospels were probably built on legends that may or may not originate with the apostles. Matthew, Mark, and Luke are remarkably similar. John is a little different.
The doctors keep harping about the virtue of "low-sodium diets", but I will choose to take anything you have to say regarding Christianity with "a grain of salt".