I'm probably lagging on this discussion, but I've gone from disappointment in my fellow religious, to mild confusion, and back to disappointment.
Pew's survey shows that people who are more religious are also more inclined to believe that the use of torture is justified more often than not. Those who attend services weekly make up almost half of their sample and bring up the national average significantly. In addition, comparing their survey of the nation as a whole with Gallup's survey could suggest that the public is fairly informed on the issue. Pew used the word "torture" while Gallup used the term "harsh interrogation techniques" and came up with similar numbers (49-47 Pew, 51-42 Gallup - so the use of words may have a small effect).
In theory, the religious, at least among Christianity, should have a strong sense of human rights issues. Ideally, the average religious Christian should oppose the death penalty, abortion, embryonic stem cell research, gay marriage, euthanasia, and theoretically also oppose the use of torture on others (of course, this is a broad generalization).
Gauging the partisan breakdown of the religions the conclusion I came to is that partisan identification matters more than religion identification. But just how important is party as compared to religion? Or just party in general? Shouldn't religion be the more dominant and common factor in a person's daily life?
Edit: I cited the wrong part of the Gallup poll. There's a large overall difference in support for torture: 49-47 Pew, 55-35 Gallup, an 18 point difference. The partisan split is interesting though. Democrats: 36-60 Pew, 39-54 Gallup. Indies: 54-42 Pew, 55-34 Gallup. GOP: 64-35 Pew, 80-15 Gallup.