Over the longer term there has been a substantial and relatively steady increase in the number of Americans having no religious identity. Gallup has been specifically tracking this trend since 1948.<ref>[http://www.gallup.com/poll/128276/Increasing-Number-No-Religious-Identity.aspx Gallup: In U.S., Increasing Number Have No Religious Identity]</ref> At that point a mere 2% of Americans volunteered "no religion". In the intervening years, however, the numbers have steadily grown so that in 2008 the figure had reached some 16% of the population. | Over the longer term there has been a substantial and relatively steady increase in the number of Americans having no religious identity. Gallup has been specifically tracking this trend since 1948.<ref>[http://www.gallup.com/poll/128276/Increasing-Number-No-Religious-Identity.aspx Gallup: In U.S., Increasing Number Have No Religious Identity]</ref> At that point a mere 2% of Americans volunteered "no religion". In the intervening years, however, the numbers have steadily grown so that in 2008 the figure had reached some 16% of the population. |