Party identification among religious groups and religiously unaffiliated voters The relationship between partisanship and voters’ religious affiliation continues to be strong – especially when it comes to whether they belong to any organized religion at all. The gap between voters who identify with an organized religion and those who do not has grown much wider in recent years. Protestants mostly align with the Republican Party. Protestants remain the largest single religious group in the United States. As they have for most of the past 15 years, a majority of Protestant registered voters (59%) associate with the GOP, though as recently... View Article