A fundamental Bahá’í principle is the essential oneness of religion, and that religion is progressively revealed by one God. “It is clear and evident to thee that all the Prophets are the Temples of the Cause of God, Who have appeared clothed in diverse attire. If thou wilt observe with discriminating eyes, thou wilt behold Them all abiding in the same tabernacle, soaring in the same heaven, seated upon the same throne, uttering the same speech, and proclaiming the same Faith. Such is the unity of those Essences of Being, those Luminaries of infinite and immeasurable splendor!” Bahá’u’lláh, Gleanings from the Writings of Baha’u’llah, p. 50.
“In the utmost unity and harmony, they must worship God, in the worshipping places of one another and they must abandon these false fanaticisms. Man must be possessed of sincerity and love and must be in a state of peace and safety. When you mention God to me, I must be pleased with you. The mention of God is good, no matter by what tongue.” ‘Abdu’l-Bahá, Star of the West, Volume 5, p. 37.