America is now losing religion faster than any other nation. American churches lost 20% of their members in the past two decades. Two-thirds of teens raised in church drop out in their twenties. Southern Baptists lost two million members since 2005. Mainline Protestantism is fading to a shadow. Meanwhile, churchless Americans began soaring in the 1990s and climbed past one-fourth of the population. They tend to hold compassionate social views and have become a powerhouse in "Left Coast" politics. If they continue rising as a progressive political force, America will be a better place for it.