This is something that I realised indirectly a few weeks ago, and have been thinking over more in recent days, and I've come to realise the inherent nonsensical nature of the entire concept of an eternal creator-god. I'd go so far as to say it's even more nonsensical than saying the universe itself is eternal.
I think when religious people say or believe their ultimate deity is eternal, they fail to realise the sheer scope of that. This divine being has been around longer than any amount of time that could ever be comprehended by mankind. They have been around forever before they supposedly made the world. And then, supposedly, they made the universe with the Earth as its crown jewel.
But this very concept is one astoundingly hard to believe: 'He' had been sitting around doing nothing for an eternity! What was he doing during this time, thinking of what to make? But he's perfect, he'd know whatever he wanted to make in an instant. The very notion that he just sits around forever before anything is entirely nonsense, and is so stupid that not even the 'you don't understand the mind of god' card can be pulled to sufficiently refute the absurdity of this notion.
And then you have the other possibility, that he's been creating things during that time. But that 'time' has been an eternity, meaning he's made an infinite amount of things, he's given rise to life enough times to literally be uncountable. And here comes another shortcoming of the 'eternal deity' belief. If you subscribe to the belief that God was doing stuff before us for an eternity, then he had literally no reason whatsoever to care for us, and we would certainly not be the main focus - if looked upon at all after our creation - by this god. We would be just one creation among an eternal, infinite sea of creations, and God would simply not care for us. It's not a matter of him forgetting about us - his memory is theoretically perfect - we'd just be an infinitesimally tiny and insignificant flash in that grand memory, and there is no reason that we should be seen as special by him.
Just wanted to put these ideas forth and see what people's responses are to this. I'm primarily going by the two main religions I know the most about - Christianity and Islam - but the above could be applied to any eternal creator god belief. In summary, god sitting around forever before us not doing anything is pure crap, and we are simply in no way special to him if he was doing stuff before us.