If I am not mistaken, wasn't the head of LTTE Prabhakaran himself a Christian?
Similarly, not even all of Maoists are Hindus!
The arguments about comparing Bodos with Islamic terrorists is fundamentally flawed because of the reach, implications of their actions. You don't see Bodos blowing themselves up everywhere in the world, nor do they indulge in terrorism for any religious purpose.
On the other hand, if somebody picks up arms because his religion asked him to (especially if the religion itself is spread out globally), the implications are truly horrendous.