One of the fundamental doctrines of the Bahá'í Faith is the unity of the world's great religions. This does not mean that all religions are the same, but that there is only one true religion and all of the Messengers of God have progressively revealed its nature.
The world's great religions are progressive expressions of a single unfolding Divine plan, "the changeless Faith of God, eternal in the past, eternal in the future."
Bahá'ís teach that the founders of the world's major religions, including Krishna, Buddha, Zoroaster, Abraham, Moses, Jesus Christ, and Muhammad, are divine Messengers sent by the one God to educate humanity through teachings and laws suited to its stage of development.
The Bahá'í Faith recognizes two additional Teachers for this age: the Báb and Bahá'u'lláh. Bahá'ís believe that religious revelation will continue in the future to provide guidance to "an ever-advancing civilization."
Bahá'ís do seek to spread their faith, believing it to be the most recent and beneficial revelation from God to humanity, but they strongly emphasize unity, harmony and respect between the world's existing religions.
More - 'The Changeless Faith of God' - Bahai.org
