Nothing surprising with the numbers as the young and less religious show more support
A clear majority of Americans (57%) favors allowing gay and lesbian couples to enter into legal agreements with each other that would give them many of the same rights as married couples, a status commonly known as civil unions. This finding marks a slight uptick in support for civil unions and appears to continue a significant long-term trend since the question was first asked in Pew Research Center surveys in 2003, when support for civil unions stood at 45%.
Over the past year, support for civil unions has grown significantly among those who oppose same-sex marriage (24% in August 2008 to 30% in 2009) while remaining stable among those who favor same-sex marriage. At the same time, opponents of same-sex marriage continue to outnumber supporters overall. An August 2009 Pew Research Center survey finds that 53% oppose allowing gays and lesbians to marry legally, compared with 39% who support same-sex marriage, numbers that are virtually unchanged over the past year
http://people-press.org/report/553/same-sex-marriage