Details about America's youngest eligible voters and their faith are coming into focus.

A survey of about 2,000 millennials aged 18-24 found major religious shifts among this age group, according to the Public Religion Research Institute and the Berkley Center for Religion at Georgetown University.

The survey found that all Christian groups have millennials leaving their ranks. Catholics saw the the biggest drop of nearly 8 percent less millennials identifying with the religion.

Now, 25 percent of those in this age group say they are "religiously unaffiliated." Nearly 14 percent of millennials have left the religious traditions of their childhoods to become unaffiliated.

"Millennials are much less likely to say they have a personal belief in God like someone you can have a relationship with," Robert Jones, with the Berkley Center at Georgetown, explained.

"They're more likely than older generations to say that God is a more impersonal force in the universe," he said.

Millennial Christians also have a more liberal view of the Bible than perhaps their parents.

"[Millennials are] much more likely than Americans as a whole to have a literal approach to the Bible," Jones said. "They are much more likely to say that the Bible should be open to interpretation."

Also, when asked to compare their generation to that of their parents, 40 percent of millennials had negative things to say about themselves.

Millennials described themselves as lazier, less moral, and more selfish.

The big question this year is how will this age group will impact the presidential race. Nearly 60 percent of them have never voted in a presidential election before.

Analysts expect to learn more about the political choices of millennials when a second survey is conducted this fall.