The Bahá'í Faith is a religion of Iran that was founded in the 19th century by Bahá'u'lláh. It is an independent world religion that emphasizes the spiritual unity of all humankind. The Bahá'í Faith has over five million adherents worldwide, and is the second-most widespread religion in Iran after Islam. The Bahá'í Faith teaches that there is one God, and that all major religions are part of a single, progressive process through which God reveals His will to humanity.