The Pew Forum found that half of regular churchgoers think that torture is often or sometimes justified. 60% of evangelicals agree.
Torture expert Darius Rejali found that people who are likely to support or commit torture are loyal to institutions. If the leaders of the institution say torture is necessary, the institutional loyalists are likely to accept that.
Much of my own research has shown that the core of most churches are institutional loyalists. They are the people most likely to be regular churchgoers.
Therefore, the leaders of the church, especially the evangelical church, need to say loud and clear that torture is wrong, un-Christian, un-American, and good loyal church goers should not torture.