Mainline Protestantism — United Methodist, Episcopal, United Church of Christ, Presbyterian Church in the US, the Evangelical Lutherans, etc. — has by and large departed from anything recognizable as Christian orthodoxy. Conservative, traditional Christians still in those denominations would understand quite well what Santorum is referring to, and I don’t know that his comment would necessarily hurt him in the south. I have been to churches of many denominations in the south and I, as a former evangelical Christian, and now an Orthodox Christian, have always felt at home.
Having said that, whenever I hear Santorum talking like this, I wonder if he is running for President or is on an evangelistic tour.
Absolutely right and that's clear what Santorum was referring to. This Protestant agrees with him. The old mainline confessional denominations have gone to the dark side.