Rick Santorum

He won 11 primaries in 2012 with his devoutly Catholic, homeschooling-dad culture-warrior campaign. On May 27, he declared for the 2016 race with his traditionalist moral views freshly sharpened.

Here are five faith facts about Santorum.

How many voters know that former Florida Gov. Jeb Bush is a Roman Catholic? Or that Texas Sen. Ted Cruz is a Southern Baptist, not a Latino Catholic? Or that Florida Sen. Marco Rubio worships at both a Catholic parish and an evangelical church?

More importantly, does it matter?

Actually, it does in today’s Republican Party, where a number of factors have forged a new religious identity that supersedes familiar old categories.

These prominent Republicans are emblematic of the new religious amalgam that, in many instances, has helped refashion denominational differences that were once almost insurmountable. Look no further than the stunning Virginia primary victory of Dave Brat, a Catholic with degrees from a Reformed Protestant college in Michigan and Princeton Theological Seminary, who took down House Majority Leader Eric Cantor last week.

Most of the first punditry around Rick Santorum suspending his quest for the Republican presidential nomination focuses on his drop in the Pennsylvania opinion polls and his difficulty in fundraising. Those were no doubt part of the decision. But there’s a deeper reason more important than political considerations.

As has been frequently reported, Sen. Santorum and his wife Karen’s youngest child Bella, was born with a rare and usually fatal chromosomal condition known as Trisomy 18. Bella, 3-years old, has been hospitalized twice already this year with pneumonia, most recently this past weekend.  Santorum took two days from campaigning to be with her.

Does Rick Santorum's Southern surge also herald the return of the Religious Right?

Last January, the titans of Christian conservatism were widely dismissed as irrelevant, at best, after 150 of them gathered for an evangelical "conclave" at a Texas ranch and anointed Rick Santorum as their champion -- only to see him finish third in rock-ribbed South Carolina a week later, well behind Newt Gingrich and even their least-loved candidate, Mitt Romney.

Now, however, with Santorum on an roll after big primary wins on Tuesday (March 13) in Alabama and Mississippi, those born-again bigwigs and their allies may be having the last laugh.

"People have been writing the obituary of the pro-family, evangelical movement for 25 years -- and they're always wrong," said Ralph Reed, head of the Faith and Freedom Coalition and the architect of the Christian Coalition in the 1980s.

In Tuesday’s Mississippi and Alabama primaries, about eight of 10 voters identified as evangelical, locking in victories for former Sen. Rick Santorum, and proving once again the importance of the evangelicals in the election.

Presidential hopefuls are again battling it out to be the God candidate, but the tide of the so-called “evangelical vote” seems ever-shifting. Santorum—a Catholic—is doing better to court most evangelicals, while former Massachusetts governor Mitt Romney — a Mormon — is beating out Santorum among Catholics. And according to a recent poll, Republicans in the Deep South are still questioning whether President Barack Obama is a Muslim.

Religion matters.

But what does the “evangelical vote” even mean anymore? And can any one candidate really claim it? Even with Santorum’s win Tuesday, a significant number still fell into Romney’s column — and that’s just among Republican evangelicals. Obama was able to draw some evangelical support in 2008 and could garner more in November.

New analysis by the Pew Forum on Religion & Public Life, based on National Election Pool exit polling conducted during the Super Tuesday GOP primaries, shows that Mitt Romney continues to struggle among the GOP’s white born-again/evangelical voters. He did win the evangelical vote in two of the seven states where exit polling was conducted: Massachusetts (where he served as governor); and Virginia (where neither Santorum nor Gingrich were on the ballot). In four states, Romney received significantly less support from evangelicals than from non-evangelical voters — continuing the pattern seen in previous caucuses and primaries.

Mitt Romney has trounced Rick Santorum, an ardent Catholic, among Catholic voters, but Romney's support among evangelicals has wavered thus far in the GOP presidential primary, according to a new analysis of exit poll data.

Though he won evangelicals in two states, in general Romney has performed 15 percentage points better among non-evangelicals, according to an analysis released March 2 by the Pew Forum on Religion & Public Life. 

Exit poll data is available in seven of the 11 states that have held primary contests to date, according to the Pew Forum. More detailed religious affiliations are available in six of those states.

White evangelicals formed more than a third of all GOP primary voters in each state except for Nevada (24 percent) and New Hampshire (21 percent). Romney, a Mormon, won the evangelical vote in those two states, and nearly tied for first in Arizona and Florida. But he lost the evangelical vote badly in three states: Michigan, Iowa and South Carolina.

Somewhat surprisingly, Santorum has not won the Catholic vote in a single state in which data is available, according to the Pew Forum.

Christianity in America is in danger. As former Senator Rick Santorum recently pointed out, young people are leaving the church in droves.

In the mid-1980s, evangelical 20-somethings outnumbered those with no religious affiliation — the so-called “nones” — by a ratio of more than 2 to 1. By 2008, those proportions were almost flipped, with young “nones” outnumbering evangelicals by more than 1.5 to 1.

An entire generation, my generation, is leaving the church. What’s the cause? Santorum blames higher education, telling Glenn Beck last week that "62 percent of kids who go into college with a faith commitment leave without it."

The “war on religion” has become a frequent bogeyman among Christian and political leaders. But the reason church leaders have failed to stem the tide of a generation heading for the exit door is that they keep looking for an outside enemy to blame when the biggest problems are inside the church.

The years young adults spend in college aren’t causing them to leave their faith; those college years are exposing the problems with the faith they grew up with.

The exodus has little to do with liberal college professors, which insurance plans should cover contraception, where mosques are being built, or whether or not the Ten Commandments are hanging in courtrooms, even if many religious leaders act as if these are the greatest Christian “battles” of our lifetime.

Republican presidential hopeful Rick Santorum's claim that U.S. colleges drive young Christians out of church is facing scrutiny from Protestant and Catholic experts.

Santorum told talk show host Glenn Beck late last week that "62 percent of kids who go into college with a faith commitment leave without it." He also has called President Obama a "snob" for wanting more Americans to attend college.

"There is no statistical difference in the dropout rate among those who attended college and those that did not attend college," said Thom Rainer, president of the Southern Baptists' LifeWay Christian Resources research firm. "Going to college doesn't make you a religious dropout."

A 2007 LifeWay survey did find seven in 10 Protestants ages 18 to 30 who went to church regularly in high school said they quit attending by age 23.

The real causes: lack of "a robust faith," strongly committed parents and an essential church connection, Rainer said.