Perhaps it’s the way Christianity was supposed to be, or perhaps not. Did being a Christian mean something more in its first few centuries or was it the Christianity of later centuries with its more fully developed theology? I don’t really know, but I’ll let you know when I find out.
Most of what we do know about early Christianity comes from a group of writers known as the Church Fathers; they give us snippets of what Christians at different times in the early church were thinking about and dealing with. These authors can be divided into a few artificial but helpful categories. You can read more about them by clicking on the links below:
Additionally, early Christians did not have fully articulated theological beliefs. But when doctrines were twisted and distorted by different heresies and sects, Christians more fully enunciated their beliefs. Read about them in Heresies