Junipero Serra Backlash America's first Hispanic saint orig_00023325.jpg
Junipero Serra Backlash America's first Hispanic saint orig_00023325.jpg
Now playing
02:39
Backlash against America's first Hispanic saint
Pope Francis (R) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as a welcome rest-stop for Obama during a six-day European tour dominated by the crisis over Crimea, and the US leader will doubtless be hoping some of the pope's overwhelming popularity will rub off on him.    AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
PHOTO: AFP/Getty Images
Pope Francis (R) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as a welcome rest-stop for Obama during a six-day European tour dominated by the crisis over Crimea, and the US leader will doubtless be hoping some of the pope's overwhelming popularity will rub off on him. AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Now playing
02:20
Some Republicans hesitant about Pope's Washington visit
Pope Francis arrives to celebrate Mass in Revolution Square in Havana, Cuba, Sunday, Sept. 20, 2015. Pope Francis opens his first full day in Cuba on Sunday with what normally would be the culminating highlight of a papal visit: Mass before hundreds of thousands of people in Havana's Revolution Plaza.  (Tony Gentile/POOL via AP)
PHOTO: Tony Gentile/ap
Pope Francis arrives to celebrate Mass in Revolution Square in Havana, Cuba, Sunday, Sept. 20, 2015. Pope Francis opens his first full day in Cuba on Sunday with what normally would be the culminating highlight of a papal visit: Mass before hundreds of thousands of people in Havana's Revolution Plaza. (Tony Gentile/POOL via AP)
Now playing
03:26
Where politics and the pope collide
Muslim flight attendant says she was suspended by ExpressJet for refusing to serve alcohol in accordance with her Islamic faith.
PHOTO: CAIR
Muslim flight attendant says she was suspended by ExpressJet for refusing to serve alcohol in accordance with her Islamic faith.
Now playing
01:25
Flight attendant: I was suspended for religious beliefs
finding jesus brother james_00000023.jpg
finding jesus brother james_00000023.jpg
Now playing
01:17
Is this the first physical evidence of Jesus?
PHOTO: courtesy Lucasfilm
Now playing
01:03
Is 'Star Wars' Islamic?
	WASHINGTON - APRIL 19: U.S. President Barack Obama (R) participates during an Easter Prayer Breakfast April 19, 2011 in the East Room of the White House in Washington, DC. Obama hosted Christian leaders from across the country for a time of prayer, reflection, and celebration of Easter. (Photo by Alex Wong/Getty Images)
PHOTO: Getty Images/file
WASHINGTON - APRIL 19: U.S. President Barack Obama (R) participates during an Easter Prayer Breakfast April 19, 2011 in the East Room of the White House in Washington, DC. Obama hosted Christian leaders from across the country for a time of prayer, reflection, and celebration of Easter. (Photo by Alex Wong/Getty Images)
Now playing
01:34
Poll: Many wrong on Obama's faith
bible belt atheism_00014928.jpg
bible belt atheism_00014928.jpg
Now playing
01:51
Atheists gather in the Bible Belt
ctn pkg casarez isis targets religion_00014920.jpg
PHOTO: West Warwick Police Department
ctn pkg casarez isis targets religion_00014920.jpg
Now playing
02:38
Is there an international attack on faith?
ac dnt tuchman faith healing idaho_00052611.jpg
ac dnt tuchman faith healing idaho_00052611.jpg
Now playing
05:32
Religious sect shuns doctor, children pay the price
scientology documentary Going Clear HBO orig_00021027.jpg
scientology documentary Going Clear HBO orig_00021027.jpg
Now playing
03:37
Scientology lashes back at documentary
lead dnt foreman finding jesus fact vs fiction_00023022.jpg
PHOTO: Getty Images
lead dnt foreman finding jesus fact vs fiction_00023022.jpg
Now playing
02:35
Investigating the Bible: Fact vs. fiction
Now playing
01:36
Why more millennials are atheists (2014)
orig shubert prophet mohammed images_00000416.jpg
orig shubert prophet mohammed images_00000416.jpg
Now playing
02:21
Why are images of the Prophet Mohammed so offensive?
hajj pilgrimage mecca_00003308
hajj pilgrimage mecca_00003308
Now playing
01:39
Hajj: The pilgrimage to Mecca
(CNN) —  

American religious affiliation has declined in small but measurable ways over the past few years, according to a new religious survey released by the Pew Research Center on Tuesday, and those changes are trickling down to the voting booth.

A growing portion of young, religiously unaffiliated individuals are driving changes in Americans’ religious attitudes, reshaping the religious composition of both the Democratic and Republican parties, with the potential for policy position changes as a result, according to the survey.

The latest data from Pew shows a slight decline in religious affiliation and belief in God among U.S. adults between 2007 and 2014. The decline is largely attributable to a growing minority of young adults that don’t identify with a particular religious affiliation.

More Democrats than ever describe themselves as religiously unaffiliated, representing a larger share of Democratic voters than any other religious denomination.

These religiously unaffiliated adults, referred to by the Pew survey as “nones,” still largely believe in God (61% say so), but they are less likely than older, religiously affiliated individuals to pray daily, attend religious services, believe in God, or say religion is very important in their lives. And the gap is growing.

In 2014, 28% of Democrats and Democratic-leaning adults identified as religiously unaffiliated, up significantly from 19% in 2007. The “nones” now comprises the largest religious bloc in the Democratic electorate, bigger than either Catholics, Protestants, or Evangelicals – though altogether, 63% of Democratic voters still identify as Christian, down from 74% in 2007.

Even Republicans have also seen a small growth in the share of their voters identifying as religiously unaffiliated.

Additionally, 14% of Republicans and Republican-leaning adults in 2014 identified as religiously unaffiliated, up from 11% in 2014, according to Pew. Many more Republicans, however, still identified as either Evangelicals, Protestants, or Catholics than as religiously unaffiliated. In sum, 82% of Republican voters describe themselves as Christian, down from 87% in 2007.

One political issue in particular has benefited from a sea change in religious attitudes – same-sex marriage. Consistent with the political and legal changes to gay rights that have taken place in the United States over the past year, the Pew survey demonstrates that the share of all Christians saying that homosexuality should be accepted by society increased from 44% in 2007 to 54% in 2014.

Pew’s survey, which was conducted last year, used a nationally representative telephone survey of 35,071 adults.