God and Mr Churchill, COP21 and the critics of Operation Christmas Child.

It's become as much a ritual as putting out sherry and mince pies for Santa. Every year thousands of school pupils up and down the country fill shoe boxes with Christmas gifts for needy children overseas. But, as Trevor Barnes discovers, questions have been raised about the agenda and ethos of the organisation, Samaritans Purse, behind this philanthropic endeavour.The Rev Val Bexton set off on foot for Paris a fortnight ago with a group of Christian campaigners concerned about climate change. Within hours they learned of the terrorist attacks and the city they arrived in this weekend was a far more sober one than they had anticipated. She sends us her audio diary. Meanwhile Christoph Nuttall, director of the R20 Regions of Climate Action, set up by Arnold Schwarzenegger, tells Sunday what he thinks can and cannot be achieved at COP21.The Pope's trip to Africa draws to a close with a visit to a mosque in the troubled Central African Republic. The BBC's Religious Affairs correspondent Caroline Wyatt is with him.Churchill historians have tended to paint a picture of the Wartime Leader as an agnostic, even atheist. A new book written by his great grandson and a former White House aide tells a different story.Producers: Rosie Dawson Zaffar IqbalSeries Producer: Amanda Hancox.