Maybe one day we'll have an inversion, and about 84% of people will be nonreligious...
Although the importance of religion in our society must not be underestimated, neither must secular America, especially the trend as it applies towards younger Americans, something I've emphasized before:
The proportion of atheists and agnostics increases from 6% of Elders (ages 61+) and 9% of Boomers (ages 42-60), to 14% of Busters (23-41) and 19% of adult Mosaics (18-22).Looking at very recent polls, around 18% of Americans do not believe in God. This trend is in line with other recent assessments of the state of atheism, and the disparity in numbers between "atheist" and "82% of people believe in God" confirms that people are still reluctant to self-identify with "the A word" despite their admission that they don't believe in God. In the largest religious self-identification survey ever undertaken, 14% of those surveyed reported "no religion" but only 0.4% explicitly as "atheist". A more recent Baylor study found only 50% of "religious nones" identify as "atheists" -- again note the disparity between non-religious persons and people willing to identify as "atheist" and/or be active in some sort of atheist organization. Another recent poll in The Nation shows that the number of nonbelievers is much higher than commonly recognized - at around 27% not believing in a God (those willing to self-identify as atheists is still much lower).
The trends are clear: although nonreligious persons are still a minority, we are a very rapidly growing one.
Regardless of the exact number, the number of atheists visible in politics is next to zero, and that is unlikely to change. Atheists are still distrusted and that prejudice won't change overnight. And that's a lot of why people are reluctant to use the label, even when they admit that they aren't theists; I really think part of it boils down to groups like the RRS. Part of it can be attributed to the corrupt and increasingly-irrelevant Religious Right and their hatred and intolerance. When atheists start to look like those people (intolerant of religion in general), we're the mirror image of Falwell and D. James Kennedy, which turns people off in droves.
And that's scary.