The official religion of Qatar is Islam, and the vast majority of Qataris are Sunni Muslims. The country adopted Islam in the 7th century and has remained committedly devout to the faith since then.
Public holidays in Qatar, apart from National Day, are also religious holidays. The main ones are Eid Al Fitr (which follows Ramadan) and Eid Al Adha, which follows 40 days after Eid Al Fitr.
Qatar respects followers of other religions and it is expected that non-Muslims resident in Qatar should mutually respect the laws and customs of the Islam, the official religion of the country. This means adherence modest standards of dress and behaviour in public, in addition refraining from mocking or denigrating Islam in any way.