According to the study, only 12 per cent of Britons feel they "belong" to a church, compared with 52 per cent in France.
It also found that the UK has one of the highest rates of "fuzzy faith" - or people who have an abstract belief in God and an ill-defined loyalty to Christian traditions.
He added: "Fuzzy faith is a staging post on the road to non-religion. Adults still have childhood memories of being taken to church, and they maintain a nostalgic affection for Christianity but that is dying out.
"They still go along with the some kind of religious identity but they're not passing it on to the next generation, and people who aren't raised in a religion don't generally start one as adults."...