Former prisons minister Ann Widdecombe will attack David Cameron for failing to act as tough on the persecution of Christians as he does on the abuse of homosexuals.
She claims the Government is operating double standards by threatening to cut aid to countries where people are persecuted because of their sexuality while "turning a blind eye" in areas where there is state-sponsored violence towards Christians.
The ex-Conservative MP, who is now a special envoy on religious freedom, will claim even hedgehogs get a better deal from the Government.
In a speech to the annual conference of international charity Aid to the Church in Need (ACN), she will say: "David Cameron's Government have threatened to cut the overseas aid budget for countries which persecute homosexuals.
"Fair enough. But what about Christians? When do we qualify for such protection or don't we?Â
"You stand a better chance of earnest representation if you are a hedgehog - and I speak as a patron of the Hedgehog Protection Society."
Miss Widdecombe, a convert to Catholicism in 1993, will call for Christians to pressure the Government and their local MPs into action.
"Today we should all begin to act. Each of us should pick one country, pray for it, donate to the Church there, write to (UK Foreign Secretary) William Hague and the local MP."
ACN claims there have been a number of recent cases of religious persecution internationally that support Miss Widdecombe's claims. They include reports of church leaders in Egypt last week accusing the regime of an unprovoked attack that killed 25 people, mostly Coptic Christians.
Neville Kyrke-Smith, UK director of the charity, said: "The persecution of Christians is a critical issue which we will be addressing on Saturday in a series of talks. It is a sell-out event - which must stimulate debate and action."