I beg to differ Guru nanak Mission was clear he was not a wandrer but a dlivere of Message of Nirankar.
He got the Naam and spread it out in all four directions and he was very successful.
Guru Nanak did not learn he Knew as a Child as a young man and as a householder the right from the wrong.
It is not important to compare relions it is important to understand the messsage underlying. When we compare we bring in many egos.
Because of that "Many Hindus believe that Shanker's Shivling is in Mecca and that is the black stone the Muslims Kiss when they go on Huj. So many such Hindus might be eager to go to Mecca but can not being regarded as Kafirs.
Many Muslims believe Jews are Muslims.
Many Jews believe Jesus was not a son of God and
Many christian believe that all other religions are useless only God 's son was jesus.
Many believe that Jesus died to clean our sins so non christian can not be saved."
The above views are there with many we do not judge them right or wrong because those who do not agree to any Truth or faith it is because their ego stops them as their efo is embedded with their faith or belief.
Only saints become above these narrow thaughts. I regard that these are some sort of views expressed by common people with low intellect who keep talking to show down others because fundamentally they are egoist. and an Egoist can not accept that others can also be right.
Guru Nanak's first condition is that if you want Him to come in your heart then clean it of the egos. "Haumein Wada Rog Hey" Hence such person is a sick person by that standard.
HP luthera