Does mankind need a creator God to expain mankind's existence?

Where do we come from ultimately?

I mean by ultimately is that we come from our parents and our parents come from their parents and on and on and on.

But there was a time when there was no life in the world, so we have now one phase of the world where there was no life yet.

Still going farther into the past, there was a time when there were no material things.

So, we finally come to what I call the ultimate reality, which is God the creator and operator of all things that are not God Himself.

What do you everyone say, do you now know what is the meaning of the word, ultimately?

Or there be some of mankind who claim that ultimately there is no God, but everything came from nothingness.

That is just plain absurd, for there is no such being as nothingness, but there is only ultimately God, the creator and operator of everything that is not God Himself.

Are there members of mankind who claim that ultimately God is not needed at all, so I ask them, what then is the ultimately origin of mankind?