As a supplement to leo's post, God answered to Moses in the ancient greek orginal text: "ἐγώ εἰμι ὁ ὤν".
A more accurate translation in english that encapsulates the meaning of the greek origianal text would be: "I am/become the One, the One that has Existance".
In ancient greek be and become are identical. Coincidense?
Food for thought.