Religion in Greece is dominated by the Greek Orthodox Church, which is within the larger communion of the Eastern Orthodox Church. It represented 90% of the total population in 2015 and is constitutionally recognized as the "prevailing religion" of Greece. Religions with smaller numbers of followers include Islam (comprising 2% of the population), Catholicism (comprising less than 1% of the population), Evangelicalism, Hellenic Paganism, Sikhism and Hinduism. Also a small number of Greek Atheists exists, not self-identifying as religious. Religion is key part of identity for most Greeks, with 76% of Greeks in a 2015-17 survey saying that their nationality is defined by Christianity. Statistics on metaphysics and worldview, do not concern narrowly only the hyponym religion.According to othe