Bahá'ís believe that there is only one God, the Creator of the universe. This one God has absolute control over His creation (omnipotence) as well as complete knowledge of it (omniscience).
Bahá'u'lláh emphasized that God is entirely self-sufficient and independent of all His creation. He has no need of human worship or allegiance, so the obedience he asks of humankind is entirely for the benefit of individuals and motivated only by his love for them.
Bahá'ís teach that although we may have different concepts of God's nature and call Him by different names – Allah or Yahweh, God or Brahma – nevertheless, we are speaking about the same unique Being.
According to the Bahá'í Faith, God is ultimately unknowable. Humans rightly describe God as the All-Powerful, the All-Loving, the Infinitely Just, but such terms are derived from a limited human experience of power, love, or justice. To remedy this, God has sent a series of divine Messengers to humanity.
- The Bahá'í Concept of God - Bahai.org