In the 61st episode of Merely Catholic, the podcast series for the Catholic Herald, Dr Gavin Ashenden talks to Tim Dieppe about challenge of Islam to Western democracies and the values that underpin them following mass migration and radicalisation triggered by war. Mr Dieppe is head of public policy at Christian Concern, which he joined in 2016, and has a special interest in Islamic affairs. He co-authored the book Questions to Ask Your Muslim Friends with Beth Peltola and also contributed two chapters to Beyond the Odds: Providence in Britain's Wars of the 20th Century by John Scriven.