From Longman Dictionary of Contemporary Englishsomething is (like) a religionsomething is (like) a religionINTERESTEDused when saying that something is very important to someone and they are extremely interested in it and spend a lot of time doing it, watching it etc Football was a religion in my family. → religion
Examples from the Corpus
something is (like) a religion• If there is a theme here, it is religion.• But Cirrito is quick to point out that Rastafarianism is a religion, whereas reggae is a beat.• This form of witchcraft is a religion of the earth. 