The story of the film, which I have not yet seen, is apparently about a Sikh police officer who travels to New York and single-handedly foils a plot to assassinate the US President. This sounds like a pretty good, positive storyline. The crazyfolk were offended apparently by the title - a sacred phrase - and that the lead character was played by Sunny Deol, a Hindu, and scenes depict him being chased by scantily clad women, while Sikh scriptures are being recited.
Sunny is actually a very popular actor given to playing the lead role in patriotic films, like "Border", and his father, Dharmendra was a dashing star of yesteryear. They are Punjabis, and one could almost consider them Sikhs.
The Sikhs earlier were embroiled in a misguided secession and terrorist movement from India in the 1980s, that was ended by strong police action, and subsequently the assassination of the Indian Prime Minister, Indira Gandhi, by two of her Sikh bodyguards.
Historically, the Sikhs were an offshoot of Hinduism, initially close to Sufism, and subsequenly a warrior clan-like religion dedicated to fighting against the Muslim rulers of India, like Aurungzeb.
The film,"Jo Bole So Nihal", or "By God's Word", is apparently a middling film. The reviews have it as a lame comedy/action film, one that would likely have sunk without a trace were it not for these unfortunate incidents.
"The problem is, the comedy can't make up its mind whether it wants to be a satire or slapstick. The narrative is finally much of neither. It all adds up to a whole lot of chaotic mayhem about gangsters and terrorists."
Update: I was able to find a torrent for "Jo Bole So Nihal" - I do not think this is a complete version of the film.
Update: Some additional news on the third blast, and the captured terrorist on the main page