Guru Nanak came to show the way to attain God. He came to seperate truth from the false ways. Sikhi is a way of life that he created to attain salvation. So i guess you can say yeah he did create a “religion”, but its deeper than that. That is why sikhs dont like saying sikhism but sikhi. The ism is a western invention which doesnt show what sikhi is. Lol hopefully that helps somewhat