Only God knows what all of his attributes are, and all of them are equally important.
However, the most important concept we must understand about God is that he is ONE, and that he has no partners, begets none, and was not begotten.
"Gods"? As far as I know, most Iranians are muslims, and therefore monotheistic.
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The most important of the Hindu gods is Lord Vishnu.
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There are three important gods namely Zeus ,Posidone and Hades
This question should not even be asked, because we are speaking of the Lord of all Creation. Each and every one of His attributes are equally important. There is nothing about God (Allah) that we can say is 'more' or 'less' important. That would be a question you could ask about what is created, but not the Creator.
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Their most important thing to them was their gods and religion..
The most important god was "Ra".