Photos to accompany Christopher Landau's reports:
On last night's programme, our religious affairs correspondent reported from Cologne in Germany, where the plan to build one of Europe's largest mosques by the largely Turkish Muslim community - on this site -
has won support from local church and civic leaders. This is the proposed new mosque:
But they've issued a challenge to the Turkish government, asking that Christians in Turkey should be able to worship freely at an historic church in Tarsus, the Turkish birthplace of St Paul.
(Catholics worshipping in Mersin, almost 20 miles from Tarsus.)
That church is currently run by the government - as a museum: