Was Guru Nanak Dev Ji the Lord Himself?
Let's see what Jaagat Jyot Dhan Dhan Sri Guru Granth Sahib Ji say about this which we can understand easily.
риЖрикри┐ риири░ри╛риЗригрйБ риХри▓ри╛ ризри╛ри░ри┐ риЬриЧ риори╣ри┐ рикри░ри╡ри░ри┐риприЙ рее
риири┐ри░рй░риХри╛ри░ри┐ риЖриХри╛ри░рйБ риЬрйЛридри┐ риЬриЧ риорй░рибри▓ри┐ риХри░ри┐риприЙ рее
риЬри╣ риХри╣ ридри╣ ринри░рикрйВри░рйБ ри╕римрижрйБ рижрйАрикриХри┐ рижрйАрикри╛риприЙ рее
риЬри┐ри╣ ри╕ри┐риЦри╣ ри╕рй░риЧрйНри░ри╣ри┐риУ ридридрйБ ри╣ри░ри┐ риЪри░риг риори┐ри▓ри╛риприЙ рее
"Aap Narayan Kala Dhar Jag Mei(n) Parvario
Nirankar Aakar Jot Jag Mandal Karo
Jah Kah Tah Bharpoor Shabad Deepak Deepaio
Jih Sikhah Sangraho(n) Tat Har Charan Milaio"
(Ang 1385)
Translation of each tuk according to Bhai Manmohan Singh:
1. Assuming power, the Primal Being, of Himself, has entered into the world in the form of the True Guru.
2. Assuming the form of Guru Amar Dass, the Formless Lord has shed light in the world realm.
3. The Lord is fully pervading every-where. It is the Guru, who has lighted the lamp of His Name.
4. Whosoever grasps the quintessence of the Guru's instruction, him the Guru unites with the Lord's feet.
Now in the wake of this there should be no doubt what Guru Sahib have said.