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
The Duke of Cambridge followed in the footsteps of his wife who lived in the Middle East country as a child.
The Foreign Secretary says his resignation over the third runway would have achieved ‘absolutely nothing’.
Labour leader says decision would depend on how far controversial scheme had progressed.