Does Satan exist as an entity in Gurmat? Some Gursikhs have described seeing satan, but I am curious about this as Bhai Sahib Randhir Singh has written a whole book on the mystical unseen world (Undithi duniya) and I havent seen any mention of Satan.
Satan is mentioned in Gurbani a few times but I cant help but think this is a metaphor for Kaljug or the mind.
Satan does not exist in the same context as it exists for Muslims and Christians. In their religions, Satan is an arch-rival of God, a negative power in opposition to God. In Sikhi, Vaheguru is all in all. There is no room for a negative power in the creation of Vaheguru since Vaheguru pervades all his creation. He is omni-present. At the most, Satan may be one of the countless demons or other such creation of Vaheguru. In no way, Satan's power is universal as in Islam and Christianity.
As for mention of Satan few times, it definitely refers to Maya or the negative tendencies of Kalyug and certainly not in the same meanings as in other religions.