God "became a man" in Christ, Lewis says, so that mankind could be "amalgamated with God's nature" and make full atonement possible. Lewis offers several analogies to explain this abstract concept: that of Jesus "paying the penalty" for a crime, "paying a debt," or helping humanity out of a hole. His main point, however, is that redemption is so incomprehensible that it cannot be fully appreciated, and he attempts to explain that the method by which God atones for the sins of humanity is not nearly as important as the fact that he does so.
The rulings (‘canons’) of the first council of Christian leaders to survive provide more insight into the Christianity of this period. Held in the obscure Andalusian town of Elvira, the council shows us a world in which the gathered church leaders found it necessary to legislate against a large number of mundane activities that they determined were prejudicial to Christian wellbeing. The council decided, for instance, to forbid the holding of certain kinds of public office (such as the office of duumvir , effectively the local mayor, as the role might require inflicting punishment or abusing other Christians). What this tells us is that Christians were integrated into the fabric of social and political life, serving in public office, and so forth. Clearly, both Christians and non-Christians found that integration quite normal – Christians had come a long way since the days of the last persecution.