Rick Santorum, a Roman Catholic, has suggested that Catholics do not take their faith seriously.

Exit polls from states that have held nominating contests show that Santorum does not fare well with Catholic voters.

Several analysts have pointed to Santorum's opposition to birth control and gay marriage as possibly alienating Catholic voters.

“It's not easy to describe the typical Catholic anymore,” Thomas Reese, director of the Woodstock Theological Center, a Jesuit research institute affiliated with Georgetown University, told Reuters. “We've always traditionally been the big tent that included people of all stripes.”

A recent New York Times/CBS News poll found that an overwhelming majority of Catholics support gay unions. Forty-four percent surveyed favored marriage, and 25 percent said they support civil unions for gay and lesbian couples. Only 24 percent said the relationships of gay couples deserve no recognition.

In an appearance on the American Family Association's (AFA) Sandy Rios in the Morning radio program, Santorum was asked his views on why Catholics are not more supportive of his bid to win the GOP presidential nomination.

“I really wish I could tell you,” he said on the program. “I think the bottom line is that we do well among people who take their faith seriously, and as you know just like some Protestants, some Protestants are not church going, they are folks who identify with a particular religion but don't necessarily practice that from the standpoint of going to church and the like, and I think, you know, with folks who do practice their religion more ardently I tend to do well.”