Alistair Campbell famously once proclaimed of Tony Blair's government: "we don't do God." Two decades on, this week on Westminster Insider, host Sascha O'Sullivan goes to the politicians' church St Bartholomew the `Great to find out if that's still true.

She speaks to some of parliament's most prominent Christians about the influence of religion on politics. Liberal Democrat Tim Farron tells Sascha about stepping step down from the leadership of his party after being confronted with a choice between "being a good leader and a good Christian."

Tory MP and evangelical Christian Danny Kruger shares with Sascha how his religion informs his values as a politician and drives the policies he has helped lobby for with Conservative colleagues.

Sascha speaks to Business Secretary Jonathan Reynolds, nicknamed "the rev" because of his faith, about how his support for gay marriage legislation in 2012, led to him being "condemned by the local priest three Sundays in a row." And how, he says, he feels the need to make the case for Christian politics on the left as a louder religious voice emerges in Conservative politics.

POLITICO Playbook reporter Bethany Dawson takes Sascha inside the Alliance for Responsible Citizens conference, where British and American politicians openly called for a return to our "Judeo-Christian foundations."

And Bishop Alan Smith of St Albans makes the case for bishops in the House of Lords, while Lib Dem peer Lorely Burt and journalist Tali Fraser argue that Christian traditions still present in parliament can prove alienating for non believers and people of other faiths.

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