The Vedas exclaim from time immemorial, Ekam Sat Vipra Bahudha Vadanti, Existence is One, Sages call it by different Names (Rig Veda, 1-164-146). God, Brahman, Allah, Isvara, Jehovah, Ahuramazda, etc., is one. I offer my worship to that Supreme Being the One eternal homogeneous essence, indivisible mass of bliss and intelligence whom sages describe in a variety of ways through diversity of intellect.
Bhagwan Sri Satya Sai Baba has further elaborated it beautifully. The truth proclaimed by all religions is one and the same. The ultimate goal of all religions is the same. The primary object of religion is to cure man of his follies and make him a real human being. Equally, religion aims at promoting righteous conduct by transforming the mental attitude of man. Religion is concerned with developing in man faith in the Spirit, besides his preoccupation with the needs of the body. For all religions the foundation is morality. If morality declines, humanness will decline together with the eclipse of religion.