This research paper confirms that suicide terrorism as a tactic accounts for much of this increased lethality and that suicide terrorism is not confined to religious groups, but it is equally deadly in the hands of nationalist and secular groups. It also suggests that while suicide terrorism itself does not appear to increase civilian casualties, when it is coupled with religion, this becomes a different story. The results support the proposition that religion itself may be a necessary part of the explanation, but not a sufficient one, and that the willingness of individuals to sacrifice themselves for their cause needs further scrutiny. In an effort to understand modern terrorism’s increased lethality, it is proposed that scholars need to look further than religion as a motive and take into account modern terrorists’ willingness to use “suicide terror.” It is maintained that in addition to the role of religion, the tactic of suicide terrorism accounts for terrorism’s new lethality. In an attempt to explore the relationships between religion and terrorism’s newfound lethality, this study utilized the International Policy Institute for Counter Terrorism’s (ICT) “International Terrorism” database between 1980 and 2002. It tested the hypotheses concerning the effects of religion, suicide bombing, and the intermingling of the two, on the number of terrorist-related deaths and civilian casualties. References and appendixes 1-4