(RNS) Labels can be helpful when, for instance, applied to cans of soup or barrels of toxic waste. But they are less so when affixed to human beings – particularly when labels are meant to summarize, indelibly, one’s spiritual identity. In a recent Rolling Stone interview, Marcus Mumford, the 26-year-old lead singer of the wildly successful British band Mumford & Sons, raised the hackles of religious folks (in some quarters) when he declined to claim the “Christian” label as his own. You see, Marcus is the son of John and Eleanor Mumford, who are the national leaders of the Vineyard Church in the U.K. and Ireland, an arm of the international evangelical Christian Vineyard Movement. Last year, he married actress Carey Mulligan, whom he’d met years earlier at a Christian youth camp.