If scientist don't blame it on dust and gravity then what do they blame it on? Wind? Maybe it just isn't possible to find God. I don't know why scientist insist they can and will find him. He leaves no trace because he didn't intend for that to happen. Don't ask why because he's God and he knows what he is doing. As for who created God, that's not for us to know as we are just questioning how the universe, earth, and life have came into existence. I don't even think we can fathom how he came to be because we are only humans and only can know so much. If we actually knew how God was created then we would probably be killed instantly because of all the knowledge of learning that.
But for me personally, I believe he has always been in existence since the dawn of time. But I do have a propose. Maybe he created himself overtime from a weaker version? That's just a speculation and we won't know until we all die. Surely God is highly complex for him to be that powerful. So if he's that powerful many feel that he must have been created just like we were. Well, we know that something is not nothing and it requires a maker. But why? Because chance comes with a capability. And chance also gives hope. Chance cannot choose from options that do not exist which is why we know that God has always been around. Like I said, we generally cannot fathom infinity and it's a difficult concept to grasp. But it will not be hard if you don't make it hard.