Sikhism is the 5th largest religion in the world. The scriptures of Sikhism are the Sri Guru Granth Sahib, Sri Dasam Granth, and Sri Sarbloh Granth. Interactive map at https://agamsingh.me/gurbani-places-map/
I know Portugal was already established in South Asia (spice trading & colonies like Goa & Portuguese India) by the time Sikhism was founded.
Tried finding more specific info re the Portuguese & Sikhism, but Wikisource books like The Sikh Religion don't have a search function.
Did find this: Makhan Shah Labana, a key figure in early Sikhism, was a wealthy merchant who travelled to many places, including Portugal (although whether that actually means the "motherland" in Iberia or its territories in South or South-East Asia, I don't know) & learned several languages, including Portuguese.