I wouldn't have said it so aggressively, but I'm inclined to agree that God doesn't literally exist.
The word 'God' obviously exists, along with a whole variety of ideas that people associate with it. But I don't think that 'God' has any existing referrent out there in the objective world.
I'm less inclined to agree that God is 'dead'. In one sense, he never was alive, so it doesn't make much sense to say that he's died. In another sense, ideas of God still play a big role in millions of people's lives, so God can't be said to be dead in a cultural sense. It's probably true that the importance of God-beliefs in people's daily lives has been declining since early medieval times, in the West at least, as life has grown more and more secular and this-worldly. But I don't expect the influence of 'God' ideas to die out entirely in the forseeable future either.
If we are talking about personifications like Yahweh and Allah, I'm inclined to agree. I'm an atheist regarding those.
If we are talking about philosophical functions such as first-cause, source of physical law or ultimate being, I'm more of an agnostic. I don't have a clue what, if anything, corresponds to those.
I suppose that religious believers would argue that he does. In Jesus Christ's incarnation, in personal religious experience or whatever. But yeah, I agree with you very strongly that if God really did exist, and if he really does care about what we believe about him, then he could be a lot less coy, a lot more straightforward and unambiguous.