God, being so much greater than humans, must surely be far more complex ... but you're perfectly happy to accept that he/she/it didn't have to be created or 'guided' by something even more complex!
Our human brains are not capable of understanding what God is. The old testament gives a profound insight with God's answer to Moses's query about Him: "I am who am".
God is simpy existence, not just in our universe's dimensions of time an space, but in everything. God is that which exists, in every moment of time, in every dimension, in every universe, totally beyond human understanding, which is why He had to become one of us to make Himself known.
What you're saying, Alan, is that God and Nature are one and the same. True, nature is beyond our understanding but most people accept that evolution has gradually developed life from a very simple form right up to the complexity of the human brain. To add an already existing, out of nowhere, entity to have a hand in it all, simply complicates the whole explanation IMV.
To say that God is all of existence, but then make him out to be some great magician in the sky who has to impregnate a young girl in order to produce a special human being/god that would do a few magic tricks (and think that will convince the whole of humanity of the existence of himself) is such a child-like explanation that it explains nothing!
I agree with you that it is all far beyond our understanding, but how is it then that we have Christians telling us what he wants us to do; that he looks down on everyone; that he brought on a flood and wiped out whole populations and a thousand other things about him?
Do you not see that we get all these stories from antiquity because the people who wrote the tales that compile the Bible had just as little an understanding as we have but tried to explain the forces of nature to their primitive followers in a way that would satisfy them?
If you really think that God is just everything their is (Nature) then why don't you agree with Rhiannion's views on it all?