[N]early three-quarters of Americans said religious influence in public life was waning and most saw that as a negative trend. About half of respondents said churches and houses of worship should speak out more on public issues.
Nearly half of all the respondents said businesses that provide services for weddings, such as florists, should be allowed to deny service to same-sex couples if the owners have religious objections. The Pew survey also found the percentage of people who consider gay relationships sinful had increased from 45 percent a year ago to 50 percent last month, although other surveys have found that people with religious objections don't always oppose legal recognition for gay relationships.
[Jessica Martinez, a researcher in Pew's Religion and Public Life Project] said the drop in support in the Pew poll was not driven by any particular religious or political group in the sample, but was a change across the board. Pew used similar groups of respondents in terms of political and religious views for both surveys, she said. The number of Americans who told Pew they were undecided on gay marriage increased from 7 percent in February to 10 percent last month.