Jesus Before Constantine

That's now, but what about then? There is much diversity in Christianity today in terms of what constitutes necessary core beliefs, but what can we know about the earliest Christianity? Until the major councils began in the fourth century, were all who claimed to be Christian considered part of the church, or was there more to it than just claiming a name? Is there evidence for how the church understood core and necessary beliefs prior to Constantine's arrival in history and the Council of ...