This is weird. Because if he's a God, he can't have a birthday, can he? He surely is eternal. He has always been there. Right? Anyway. As he himself said (more or less) in an old sketch:
'Don't be in too much of a hurry to say what God can or cannot do, Mathew.' Now I'm talking nonsense. It's easier than trying to explain how much I love him and all he means to me, and why he is and will always be my one and only God.