More people answered than in 2011, when 2.8 million (92.4%) answered the religion question and 234,000 (7.6%) chose not to answer.
Atebodd mwy o bobl nag yn 2011, pan wnaeth 2.8 miliwn (92.4%) ateb y cwestiwn am grefydd a dewisodd 234,000 (7.6%) beidio ag ateb.