The importance of religion varies greatly between people (all absorbing, of no interest, abhorrent) and between countries (contrast theocracies and atheist / secular jurisdictions) but is difficult to measure. Surveys may attempt to determine religious beliefs (e.g., faith in God), religious practices (e.g., how often someone goes to a communal place of worship or reads the scriptures of their religion) and religious experiences (e.g., feeling that God is talking to one) and these three aspects of religion are sometimes aggregated into 'religiosity', which can be characterised as 'religious commitment'. However, there is considerable disagreement as to how best to ascertain each of these, with religious practice probably being the most objective, and some of the terms used in surveys and interviews don't translate very well between religions and languages.Perhaps the best international data on religious commitment are assembled by the Pew Research Center. In their most recent publication, weekly worship varies from 1% of the population in China, 6% in Sweden, 7% in Russia and 8% in the UK to 89% in Nigeria, 82% in Ethiopia and 72% in Indonesia, while the percentage who say that religion is very important in their lives varies from 3% in China, 10% in Japan, 10% in Sweden and 10% in the UK to 98% in Ethiopia, 94% in Pakistan and 93% in Indonesia (Pew Research Center, 2018). For a teacher, whatever their subject, what this means is that in most countries in the world, classrooms are going to contain some students for whom religion is important and some for whom it is not.