Question: When terrorists claim to kill in the name of a deity believed in, will they go to hell?
Answer: Yes, unfortunately, if there is no sincere repentance in time. This is so as such killing is always with greed (to win favour), hatred (for non-believers) and delusion (that there is a god who demands such killing); it is never with generosity, compassion and wisdom. Motivated by these Three Poisons above intensely, the lowest realm of hell is usually karmically reached.