CONCEPT OF GOD IN ZOROASTRIANISM
Zoroastrianism is an ancient Aryan religion that originated in Persia more than 2500 years ago. Though it has relatively few adherents, about one hundred and thirty thousand in the whole world, it is one of the oldest religions. Zoroaster was the founder of Zoroastrianism in the religion of Persia(or Faras) Iran, also commonly known as Parsi-ism. It is also known as the religion of fire worshippers and Magianism. 
God in Zoroastrianism is known as ‘Ahura Mazda’. ‘Ahura’ means ‘the Lord’ or 'The Master' and ‘Mazda’ means ‘the Wise’; hence ‘Ahura Mazda’ means ‘the Wise Lord’ or ‘the Wise God’. Ahura Mazda stands for God, in a strictly monotheistic sense. The word ‘KHUDA’ is the Persian word used for calling their god ie, Ahura Mazda.
According to the Dasatir, Ahura Mazda has the following qualities:
According to the Avesta, the Gathas and the Yasna give various characteristics to Ahura Mazda such as:
Creator Yasna 31:7 & 11
Most Mighty the Greatest