The millennials — those born after 1980 who began to reach adulthood around the year 2000 — are less likely to claim a religion than their parents and grandparents were at the same age, a new report says.

The Pew Research Center report released this week on millennials and faith found that one in four, or 25 percent, do not identify with a denomination or faith. They describe themselves as either atheistic, agnostic or "nothing in particular."

Among Generation X, whose younger members were young adults in the late 1990s, one in five, or 20 percent, were unaffiliated. For baby boomers, who were young adults in the late 1970s, that figure was about one in eight, or 13 percent. Older Americans are more religious, according to the report, which is based on several sources of data, including surveys commissioned by the Pew Forum on Religion & Public Life.

The report states that 85 percent of Americans now 30 and older affiliate with a faith — 14 percent say they are unaffiliated and 1 percent weren't sure.

And there is one thing in which the millennials' belief is stronger: About 62 percent believe in hell, compared with 59 percent of older Americans. That might be one reason why millennials pray more often — 45 percent pray daily, compared with 41 percent of baby boomers and 40 percent of Gen-Xers when they were in their 20s.