There's no 'old man in the sky', in my belief system, not unless you want one. I've had a 'memory' of a person who found himself in a 'heaven' on his own piece of land 'somewhere'. There was a 'God' who talked to him, from the 'sky'. He heard the voice inside his own mind.

I think you can have that sort of "God" if you really want to do so, if you need to do so. But that's really up to you. At least, that's how I see it.