Death Penalty and religious affiliation in USA

"Sharp differences also exist among members of different religious traditions. Opposition to the death penalty is lowest among white mainline Protestants (13%) and white evangelicals (15%), while it is notably higher among white Catholics (27%). Opposition is highest among seculars (29%)."

PewResearch, June 26, 2007 (Notice that the quoted stats are from 2005)

The support for death penality seems to be in decline though. (Wonder if it has something to do with secularisation?)