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PRINCETON, NJ -- Mitt Romney leads Barack Obama by 17 percentage points, 54% to 37%, among very religious voters in Gallup's latest five-day presidential election tracking average. Obama leads by 14 points, 54% to 40%, among the moderately religious, and by 31 points, 61% to 30%, among those who are nonreligious.

For the purpose of this analysis, an American's relative degree of religiousness is based on responses to two questions asking about the importance of religion in one's life and about church attendance, yielding three specific groups:

• Very religious -- Religion is an important part of daily life and church/synagogue/mosque attendance occurs at least every week or almost every week. This group makes up 41% of registered voters interviewed April 19-23.
• Moderately religious -- All others who do not fall into the very religious or nonreligious groups but who gave valid responses on both religion questions. This group makes up 27% of registered voters.
• Nonreligious -- Religion is not an important part of daily life and respondents seldom or never attend church/synagogue/mosque. This group makes up 32% of registered voters.

Voters' religiousness was a this year, with more religious Republicans tending to vote for Rick Santorum, while less religious Republicans tilted toward Romney. Despite Romney's troubles with highly religious Republican voters, he gets the disproportionate support from highly religious voters in the general election that Republican candidates traditionally enjoy. Very religious voters make up less than half of the electorate, however, and among all Americans, Romney is losing to Obama .

Romney Does Better Among Protestants

Obama is a Protestant Christian, and was a member of the Trinity United Church of Christ in Chicago, while Romney is a member of the Church of Jesus Christ of Latter-day Saints. Despite Protestants' broad religious connection to Obama, they support Romney over Obama by a five-point margin in the April 19-23 tracking aggregate. Obama is ahead among Catholics by six points, and has a substantial lead among Americans who have no formal religious identity.

There are significant differences within the broad group of Protestants -- 52% of all registered voters in the April 19-23 sample -- based on how religious they are. Very religious Protestants support Romney over Obama by a 19-point margin, while nonreligious Protestants tilt toward Obama by 11 points.

Very Religious Catholics Tilt to Romney

While Catholics -- who make up 24% of all registered voters -- tilt toward Obama over Romney, their support differs significantly based on how religious they are -- just as was the case for Protestants. Very religious Catholics tilt slightly toward Romney, while Catholics who are moderately religious or nonreligious tilt by 13- and 15-point margins toward Obama.

Romney Gets Nearly Two-Thirds Support Among Highly Religious White Protestants

One confounding factor in these results is the reality that black Americans are highly religious and highly likely to be Protestants, while at the same time very likely to be Democrats. In the latest weekly election aggregate, for example, 48% of black voters are very religious and only 12% are nonreligious, but at the same time, 89% support Obama. Thus, with nonwhites factored out of the analysis, Romney leads by 24 points among white Protestants, and by 41 points among very religious white Protestants. This latter group is the functional equivalent of the group of voters often called evangelicals.

Implications

It appears that in this year's general election, religion will continue to be a major determinant of how Americans vote for president. Highly religious Americans, particularly those who are white and Protestant, disproportionately support presumptive Republican presidential candidate Romney, while less religious Americans skew their support toward Democratic incumbent Obama. This reinforces a basic pattern in American voting behavior that has been evident for decades.

The fact that Mitt Romney continues to receive the support of highly religious white Protestants is important, given that the Republican portion of this group disproportionately supported Romney's opponent Santorum in the Republican primaries. Just as it appears that even after the bitter primary battles, highly religious white Protestants appear to be coalescing around his candidacy as well.

President Obama's notably included a number of references to the ways in which his religion and religious convictions guided his political policies. Obama's underlying theme was that religion and Democratic policies are strongly compatible. That may be the case theologically, but in the practical world of today's presidential politics, religiousness continues to translate into Republican voting -- a pattern that, to this point, does not appear to be changing.

At the moment, Obama does so well among less religious Americans that by a 49% to 42% margin. For Romney to be successful this November, it appears he will need to make further inroads into the ranks of Americans who are not highly religious.

Track every angle of the presidential race on Gallup.com's Election 2012 page.