The Hebrew word for God in Genesis 1:1 is “elohim [elohym]“. This word is plural in form, so some claim this as proof that God is more than one person. Of course, the plural form does not mean “persons”, but rather “gods”. Yahweh is not Gods; he is one God.
The Hebrew plural form used in singular settings does not designate more than one, but rather a superlative. Many Hebrew scholars refer to this as plural intensive. Thus, when the scripture says that Yahweh made Moses a god [elohim] to Pharaoh, it does not mean that Yahweh made Moses “gods”, nor does it mean that Yahweh made Moses more than one person to Pharaoh.
For more on this see:
http://godandson.reslight.net/?p=230
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