Veer ji, amrit vehle uth ke sirf, 1 month layi 5 baniyaan da paath karo te ardaas karo, you will get the answer yourself.
You cannot get answer to this question Internet. Do it yourself.
No need to ask anyone, ask guru nanak dev ji itself.
I agree that he is not, but over time religious figures are turned into incarnations of God....its just bound to happen. I know I am gonna get slammed for saying it, but I think if Guru Nanak heard people saying he was God he would not be happy...