Mark Dowd is behind the microphone in a central London studio and looking entirely at home. As this award-winning broadcaster and presenter should. His trio of Channel 4 investigations, Tsunami: Where Was God?, Children of Abraham and God is Green, as well as his BBC radio documentaries on religion, have over the past two decades made him the go-to choice of commissioning editors when they want to take a serious, well-informed but challenging look at faith.