Next Christendom

Excerpted from "The Next Christendom: The Coming of Global Christianity" By Philip Jenkins. "If there is one thing we can reliably predict about the 21st century, it is that an increasing share of the world’s people is going to identify with one of two religions, either Christianity or Islam, and the two have a long and disastrous record of conflict and mutual incomprehension. For the sake of both religion and politics, and perhaps of simple planetary survival, it is vitally necessary for Christian and Jewish Northerners to gain a better understanding of Islam. But odd as it may sound perhaps the more pressing need is to appreciate that other religious giant, the strangely unfamiliar world of the new Christianity. Southern Christianity, the Third Church, is not just a transplanted version of the familiar religion of the older Christian states: the New Christendom is no mirror image of the Old. It is a truly new and developing entity. Just how different from its predecessor remains to be seen."
According to Jenkins, “If we want to visualize a ‘typical’ contemporary Christian, we should think of a woman living in a village in Nigeria or in a Brazilian favela” (page 2).
What do these facts mean for us - "christians" in the Western world?