lol dear brother im sorry if i wanna even debate on that.

so the muslim saints wrote the verses in the guru granth sahib.
now if these saints are muslim i.e believers of islam....
then they must have been followers of the Qur'an to be muslim right and practicing muslims...

now why on earth would they write lies about their own God that they believe and their own religion to create another religion or create a holy book for people to deviate from the true path of Allah to another path...

and you said muslim saints... it takes a long time and a lot of dedication and striving hard for the sake of Allah swt to become a saint, and then why wold they do such a thing commit such a major sin to earn the WRATH of Allah swt and spend eternity in Hellfire?

that just doesnt make sense to me from a muslim perspective and on top a muslim saint!