More than two-thirds of Christians feel they are now part of a "persecuted minority", according to a ComRes poll.
The survey, commissioned by the Coalition for Marriage, also found that found more than half of Christians who backed the Conservatives in 2010 say they will "definitely not" vote for the party in 2015.
George Carey, the former Archbishop of Canterbury, has claimed that the government is “aiding and abetting” aggressive secularisation.
Two thirds of those polled said they believed allowing same sex unions was an attempt to make the Conservative Party look trendy.
More top news
A Branislav Ivanovic header in extra-time ensured that Chelsea are through to the Capital One Cup Final after beating Liverpool
Scientists have discovered the oldest known earth-size planets discovered which they say raises the prospect of 'ancient life'.
Auschwitz survivor Alina Dabrowska was a victim of the cruel experiments of Nazi doctor Josef Mengele, known as "the Angel of Death."