Presidential candidates Mitt Romney and Rick Santorum are neck-and-neck in the polls in the run-up to the Michigan Republican primary on Tuesday.

One group that Romney appears to have an advantage with is Roman Catholic voters despite the fact that he is Mormon and Santorum Catholic.

The disconnect between faith and politics highlights differences among Catholics and shows that some religious voters are focusing more on other issues.

Declaring Faith

Santorum doesn't shy away from letting people know that he's a man of faith. He visited the Knights of Columbus hall in Lincoln Park on Friday. The Knights of Columbus is a fraternal service group, sort of like a Catholic version of groups like the Shriners. Santorum is a member, and his faith a central theme in his campaign.

"I'm a Catholic, and I'm told that one of the responsibilities of the Church is to care for those who are the least among us," he said, "and I believe that, and that's a real responsibility for all of us."