Let me give my opinion on the movie in a few points:
1. Terrorists spoke Punjabi throughout the whole movie. So either they were from Pakistan or India. Now, if you pay just a little attention there accents were Indian, they spoke Punjabi like Sikhs. Using words like "Pariwar", that word is not Pakistani, we say "Khandaan" over here. So I think it's safe to assume that they were Indians or they were depicted as Indians in the movie.
2. They cursed a lot, now if they won't touch a women's bra because it's forbidden why would they use profanity? Cursing is also forbidden in Islam.
3. The Bull, The so called mastermind on the phone, he did not even remotely sound like a man with an intellect sharp enough to manipulate humans and plan a massacre of that scale. His language was not manipulative and smart like it had to be in order to lead a bunch of people to commit those acts.
4. Mumbai, the pride of India, the city that never sleeps. But just a few boys with Aks were enough to bring the whole city down. the city did not have enough armed force to stop 6 young boys? That's a bit funny to me.