Evangelical Christians have long been the foot soldiers of the Republican Party. In 2010, they made up about 36 percent of Republican voters.

But the GOP's reliance on religious voters isn't necessarily a formula for long-term success—especially since the next generation of Americans has serious reservations not just about organized religion, but about the very existence of God. For the past 25 years, the Pew Research Center has been asking voters whether they ever question the existence of God. The numbers have been pretty stable. Older voters are pretty set on God, with 86 percent of baby boomers saying they never question His existence.

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