Well, if we accept wiki's definition of education,
Education in its general sense is a form of learning in which the knowledge, skills, and habits of a group of people are transferred from one generation to the next through teaching, training, or research.
The amount of knowledge available has increased over time, but it's always a relative determination whether someone is educated or not, depending on what's available. So it really doesn't seem to make much sense to say that "people were less educated in the past."
You can say that more people as a % of the population are educated now than previously, or less, or that, say, the chinese had more knowledge than the west -- though that's debatable -- but not that people are more educated now than before because we know more.
So you can only talk about the writers of the bible as uneducated relative to the general state of knowledge at the time, not compared to now.
As far as christianity specifically, the council of jerusalem and the first ecumenical council at nicea both took place before the augustinian disregard for knowledge took hold after the fall of rome, and how they chose to frame the christian dogma was very deliberate and even cunning. They had all the greatest minds from all over the roman empire in attendance. Presumably?