A 2002/2003 study of Danish youth in upper secondary school found that 100% of Muslims believed in God and 90% believed in heaven, hell, angels and devils. Only 52% of non-Muslim Danes in the survey said they believed in God while 15-25% said they believed in heaven, hell, angels and devils. Roughly half of the Muslims in the survey said they prayed often, while a third claimed to visit a mosque once a month.[35] In a 2005 survey, 40% of Muslim immigrants and their descendants participated in religious ceremonies/services compared to 60% of Roman Catholic immigrants/ descendants did the same.