Janab Rafi Bhai,
All kinds of Hindu/Sikh Langars and Prasads are dedicated to some deities. Please note that the Sikhs believe in Guru Nanik and some other Gurus as divine.
Personally, I would not eat out of these things but never issue a Fatwa :-)
Do you know that most Sikhs refuse to consume Zabeeha meat? Jhatka is what they do which we won't accept.