MPs and religion: politics, the church and 'doing God'
3 December 2012 Last updated at 12:56 GMT
Many MPs try hard to avoid mixing politics and religion, and Tony Blair's press secretary Alastair Campbell famously said "we don't do God" when the former prime minister was being asked about his faith.
There appeared to be an unwritten Westminster rule that personal religious beliefs were kept quiet, but some people think that may now be changing.
David Thompson spoke to Labour MPs Kerry McCarthy and Diana Johnson.