A friend, who shall remain nameless, once asked me: "Do you think one can be a Baptist, and believe in the possibility of Christendom?" It is a good question, deserving of a thoughtful answer. However one ultimately answers such a question, I think one certainly should say that when a person becomes a Christian, this conversion should effect every aspect of one's existence--whether be it more traditionally "personal" things, or more "public" things--including: one's job, one's marriage, how one raises children, how one relates to neighbors, etc.,
In short: to be changed by the gospel changes everything. So, when Christ is Lord of one's life, he is Lord of every facet of existence--down to the last detail.
So, I was intrigued to see the way J.H. Bavinck treated this general type of issue--the way conversion changes everything--in his An Introduction to the Science of Missions (pages 55-56). Here is what Bavinck writes:
"The whole of human life is touched by the epistles . . . . Not only is the inner life renewed, but every relationship in which we stand is also fundamentally altered and as a consequence the whole of society is reborn. Nothing in human life is indifferent, nothing lies outside the power of sin, but also there is nothing which is excluded from the salvation of God. God will rebuild our whole existence from the ground up. Then it is indeed true that he who is in Christ is a new creature, in every respect."
The whole society is reborn. I suspect the proper way to think about how the Christian faith changes every aspect of reality should be centered in these words. When a person comes to faith, when he or she is born again from above, this changes everything, and ultimately the conversion of persons leads to the rebirth of the whole society. There may be a certain eschatology lurking in the background here, but that can be pursued later.