Martyrdom or Suicide - It all in your point of View.

During the Crusades, the Knights Templar destroyed one of their own ships, killing 140 Christians in order to kill ten times as many Muslims.

Military historians classify suicide bombing as a form of armed violence, belonging to the tactics of asymmetric warfare -- suicide bombings are only common when one side in a violent conflict lacks the means for effective, conventional attacks.

Often there is a religious element involved, besides other motives such as politics or blackmail: many suicide bombers believe that they will attain an otherworldly reward for their sacrifice. Those who send suicide bombers on missions cultivate the belief that suicide bombers are Martyrs. Palestinian television has aired a number of music videos and announcements that promote eternal reward for children who seek"martyrdom"
(http://www.pmw.org.il/tv%20part1.html).

Besides the religious aspect, there is also a simple cost-benefit analysis that motivates suicide bombing. Al Qaeda leader Ayman al-Zawahiri expresses this view clearly: "The method of martyrdom operation [is] the most successful way of inflicting damage against the opponent and the least costly to the mujahidin in terms of casualties" (ttp://www.fas.org/irp/world/para/ayman_bk.html).

Terrorist acts justified by any Religion is "Faith-based Terrorism".