Why should I hold myself to a standard that God himself doesn't? Through the Bible God has proven to be arrogant, petty, and cruel despite calling himself compassionate and forgiving in the same breath. Seems pretty immoral to me. Plus it baffles me how you can create beings with the capacity for sin and then get mad at them when they do something you disapprove of.
Personally, I think it's funny when people say God exists. But I suppose we all have things that amuse us, eh?
I believe the point that some who shout that opinion are making is that immorality cannot possibly come forth of absolute morality. Just as you cannot suddenly create light out of absolute darkness without something to cause it.
Why not? Ignoring the bad analogy which has been pointed out a few times already, why can't we call God immoral?
If he exists and created us he created our sense of morality, and by my moral standard (the Judeo-Christian and Muslim, though they are more or less the same) God is immoral. The God of the Bible are also immoral according to his own commandmends. He seems to mess up badly at the "you shall not kill" part.