Even though most Christadelphians might
say they believe because of prophecy, or because of current events, I don't think that is actually the case. Most Christadelphians believe quite simply because they happened to be born into Christadelphian families, were taught Christadelphian doctrines from a young age, and were raised in a largely Christadelphian culture. The evidence is clear. Had they not been born into such an environment, it is almost certain they would not be Christadelphians today.
