Millennials increasingly doubt the existence of God:

Dan Merica looks at the entire population:
Despite the findings on millennials, the survey shows that the United States continues to be a highly religious nation, with most Americans identifying with a particular faith. Seventy-six percent of all respondents said prayer is an important part of their lives and agreed that “we all will be called before god at the Judgment Day to answer for our sins.” About 80% said they have never doubted the existence of God.
Stephanie Mencimer considers the political consequences:
The trend lines join other bad polling news for evangelicals, namely that younger Christians are turned off by attacks on gays and lesbians. Such trends don't bode well for the Republican Party. By 2020, Millennials will make up the largest single voting bloc in the country, some 90 million strong, and they are already showing a distaste for GOP politics.
They will have come of age when the GOP revealed itself as the party of intolerance, anger, and spite. Even if Obama is defeated, the generation who brought him to power will change this country without him.