It hit the headlines recently when Liberal Democrat leader Tim Farron, a committed Christian, repeatedly tried to keep the focus on politics and not his personal beliefs.
Now, the prime minister, a Christian and a vicar's daughter, has been drawn into the debate.
During a 'live' appearance on the BBC's Andrew Marr show this morning she said that she does not think gay sex is a sin.
When asked the question: "Do you think gay sex is a sin?" she immediately replied : "No".
Mr Marr then went on to mention the furore surrounding Tim Farron and his reluctance to share his views on the issue.
The presenter asked: "Do you think there is an agressively judgemental mood imposed on Christians in this country that other groups don't have to face?"
Mrs May replied: "Obviously, anybody who is a leader of a political party, putting themselves up for election, asking the public to trust them, is going to be asked a whole range of questions from a whole range of different groups".
Mr Farron also appeared on the programme, a short time before the PM.
After it was said that he had endured a difficult first week of campaigning he replied: "I wouldnt have chosen to speak of my pesonal faith...you can't affect what people choose to ask you".
Mr Farron was eventually forced to publicise his views last week after continued pressure from parts of the media.
In Parliament, he was asked by openly gay MP Nigel Evans if he thought being gay was a sin - and replied 'I do not.'
But, that wasn't enough for some and in a subsequent television interview he answered directly by saying he did not believe gay sex was a sin.
He then pleaded for reporters to focus on the election issues adding that political leaders should not "pontificate on theological matters".
Mr Farron also said: "I am quite careful about how I talk about my faith. I do not bang on about it, I do not make a secret out of it," he said.
"On reflection, it makes sense to actually answer this direct question since it's become an issue."
He also said the Lib Dems had "undoubtedly the best record" on gay rights out of all political parties.