Sat Sri Akaal,
Guru Nanak was not against Hindu or Muslim Philosphy but ways of Pandits Brahmins Maulvis Deras Baba's were teaching, but definetion against doctrines of faith and the way rituals were made without imparting education to a mass.
There are two versions available one is physical life story other connecting eternal both available in market.
If one reads
Geeta The Celestial Sound form that appeared in the form words as a sound of HINDU, or to humans,
the five horses representing five human senses driven by expression as Krishna,
how any human can deny that the desire of five senses is not driven by expression. ,a metaphor for human expression within mind,
not the way it was taught as a false expression or as a mythological story of Krishna may be another name which appeared in history of humans told by a blind person having no vision of the subjects.
Spiritual is Spirit and Lingual
If the language describes the inner awareness it is good.
One can decide within one self, if the taught subject is good or bad.
Waheguru Ji Ka Khalsa
Waheguru Ji ki Fateh