The survey finds that the number of people who say they are unaffiliated with any particular faith today (16.1%) is more than double the number who say they were not affiliated with any particular religion as children. Among Americans ages 18-29, one-in-four say they are not currently affiliated with any particular religion.

The Landscape Survey confirms that the United States is on the verge of becoming a minority Protestant country; the number of Americans who report that they are members of Protestant denominations now stands at barely 51%.

Men are significantly more likely than women to claim no religious affiliation. Nearly one-in-five men say they have no formal religious affiliation, compared with roughly 13% of women.

People not affiliated with any particular religion stand out for their relative youth compared with other religious traditions. Among the unaffiliated, 31% are under age 30 and 71% are under age 50. Comparable numbers for the overall adult population are 20% and 59%, respectively.

Jehovah's Witnesses have the lowest retention rate of any religious tradition. Only 37% of all those who say they were raised as Jehovah's Witnesses still identify themselves as Jehovah's Witnesses.