If, as you said, the concept of god couldn't exist without emotional attachment and prior knowledge, then the first concept of god couldn't have emerged. But it did, so you're wrong.
I was speaking in the present moment of what is driving the belief in god. From personal experience, everything I 'knew' about god was from heresay and my own emotions, generally fear.
So who was this cave man who first had the idea?
But from my own experiences I have concluded that god exists.
I wonder why we have drawn opposite conclusions? I would be convinced however, if the personal experience with god is more than just imagination.