Re: Where they came from?
the adi granth which is most primitive text have 16 kashmiri pandit writers as well, it is more similar to Hindu Omkar, Omkar is unified god of hinduism which is one unperosnified element, also called Paramtatva, supereme object, rest 33 crores are manifestation of same god in different form. I have no idea of Islamic God, so one should start comparing Hindu Omkar with Islamic god first, before comparing with Sikh Onkar