Key facts as India surpasses China as the world’s most populous country
India is poised to become the world’s most populous country this year; its population has more than doubled since 1950.
Since the 1990s, large numbers of Americans have left Christianity to join the growing ranks of U.S. adults who describe their religious identity as atheist, agnostic or “nothing in particular.” If recent trends in religious switching continue, Christians could make up less than half of the U.S. population within a few decades.
The first half of this chapter provides details on the assumptions and results of each of the four main scenarios. These are not predictions for the future. Rather, projections show what would happen under a number of hypothetical scenarios. Some scenarios are intentionally implausible and meant only to illustrate the impact of different demographic forces. […]