 In this sense it differs slightly from the term 'nones' which denotes an absence of affiliation with a religions and not an absence of attendance at religious services.The Barna Group defines the term to mean "an adult (18 or older) who has not attended a Christian church service within the past six months" excluding special services such as Easter, Christmas, weddings or funerals.Barna reports that there were 75 million "unchurched people" in the United States as of 2004.