ISLE of Wight MP Andrew Turner is expected to be among Conservative MPs to oppose his party’s proposal to legalise gay marriage tomorrow (Tuesday).
MPs have a free vote on the issue, which will mean they will not be under pressure from whips to follow party policy.
The bill would allow same sex marriages, however Anglican churches would not be included and other religions would not be compelled to marry same-sex couples.
In letters to constituents over recent weeks, Mr Turner has said that he believes marriage should remain a union between a man and a woman.
He said the issue had not been in party manifestos and raised concerns that if same-sex civil marriage were permitted, then legal challenges would be made that could force religious groups to hold gay marriage ceremonies.
Vicar of Newport Rev Kevin Arkell said: "I think it is a significant change that needs to have been a campaign issue so that the people could give a mandate for it to happen."
Islander Howard Hardiman, who has been among those to contact Mr Turner and supports the introduction of gay marriage, said Conservatives had committed to considering a change in the law in their Equalities Manfiesto of 2010, written by current home secretary Theresa May.
"I fail to understand why I should accept fewer rights than my sister, my parents or my colleagues," said Mr Hardiman.