Prince William is not a regular churchgoer despite being the future "Defender of the Faith" and "Supreme Governor of the Church of England", the Daily Mail reported.
Although the 30-year-old future king was confirmed into the Anglican faith in 1997, he is understood to attend services of worship only a handful of times each year.
Most of these are connected with official engagements or on special occasions in the calendar such as Christmas, as well as weddings and christenings.
Sources told the daily William and wife Kate "rarely, if ever" go to church privately on a Sunday morning, or indeed at any other time in the week.
Queen Elizabeth is said to be a devout Christian and attends church on a weekly basis.
Prince Charles, despite his interest in other faiths, particularly Islam, has always been a regular churchgoer.
The daily said just 10 percent of the population now attend church each week, and the average age of worshippers is just under 60.
According to a survey by Christian charity Tearfund, Britain was among Europe's four least observant counties.
A spokesman for William insisted the prince was a dedicated Christian despite his lack of regular attendance.
"The Duke of Cambridge is a committed Anglican and has a strong personal faith," he said.