Gallup has done a survey and found the not very surprising result that the nonreligious and moderately religious tilt Democratic while the very religious tilt Republican. This pattern holds true (though to a smaller extent) for all subgroups such as non-Hispanic whites, Hispanics, and Asians, but not for blacks who go Democratic whatever their religiosity.
The survey concludes:
From a practical politics standpoint, Republicans face the challenge of expanding their party’s appeal beyond the minority of Americans who are very religious, and appealing to Hispanics and Asians given that even the most religious of these growing groups tilt Democratic, albeit not as much as others in these groups who are less religious. Democrats face the challenge of attempting to broaden their party’s appeal beyond the base of those who are moderately or nonreligious, a tactic that most likely will require effort to frame the party’s positions on social justice and equality issues in a way that is compatible with a high degree of religiousness.
What I found interesting are the numbers who classify themselves as very religious, moderately religious, and nonreligious.
Gallup classifies Americans as “very religious” if they say religion is an important part of their daily lives and that they attend religious services every week or almost every week. That group constituted 41% of all U.S. adults in the first half of 2014. “Nonreligious” Americans (30% of Americans in 2014) are those who say religion is not an important part of their daily lives and that they seldom or never attend religious services. The remaining group, 29%, are classified as “moderately religious.” These people say religion is important in their lives but that they do not attend services regularly, or that religion is not important but that they still attend services.
So almost 60% of Americans seem to be somewhat wishy-washy about their religion, which I take as a good sign.