Simply put, the Bahá'í Faith is the most recent of world religions. It was founded by Bahá'u'lláh, at the end of the 19th century. It is currently the second most wide-spread religion in the world, after Christianity.
It promotes the Oneness of God, the Oneness of Mankind, and the Oneness of Religion. In other words, according to Bahá'ís, all world religions are from the one and only God, and there is only one race on Earth, the Human race.