Some interesting findings from Pew Research. The biggest difference among those who claim a Christian religious affiliation is between evangelical Protestants and mainline Protestants. 62% of the former say that torture can be just justified often or sometimes, while 46% of the latter say that it can be justified often or sometimes. Those who claim no religious affiliation are the least likely (40%) to say that torture is justified often or sometimes.
The results also show that the more regularly people attend religious services, the more likely they are to approve of torture. Again, I'd like to see how the numbers look when controlled for education and income.
The picture becomes a bit more complicated if we look back at the results of an earlier Faith in Public Life survey on religion and thoughts about the acceptability of torture. Southern evangelicals split on the question of torture depending on whether they say their opinions are based on common sense or on Christian teachings. Those who say they consider Christian teachings when they think about the acceptability of torture are significantly less likely to approve torture than those who rely on common sense.
One might imagine that high levels of religiosity among Southern evangelicals would translate into considering religious beliefs when thinking about the acceptability of torture. But, according to the authors of the study, Southern evangelicals are significantly more likely to rely on common sense (44%) than Christian teachings (28%) when thinking about torture.