It's not an ordinary unknown. It's simply the most amazing thing we have. Not to say that's the very thing we identify as ourselves.
And this thing also indicates the possibility of God.
If evolution is the cause of our consciousness why it would create something totally unreal like the idea of God? The idea of God is the most pursued idea in human history as we still are talking about it now. Evolution "hates" waste, so why bring such enormous waste of energy in an unreal idea?