Why does Islam have a terrorist mentality?
This question makes an implicit assumption which is incorrect;
Islam does not have a "terrorist mentality". The religious
structure of Islam is not designed to promote terrorism. Most
Muslims behave indistinguishably from Non-Muslims on most key
life-issues, such as work relationships, education, sports
affiliations, socializing, etc.
That being said, the doctrines of Islam, particularly the holy
Islamic struggle of Jihad, make Islam much more malleable to
supporting terrorism and violence against civilians than most other
religions. (This is not to say that Christianity, Judaism,
Hinduism, Buddhism, etc. cannot be molded this way (and each has
been), but it takes more doctrinal meddling.) Islam also is not a
unity which allows Muslim terrorist organizations tell their
membership that the fight in which they are engaged is properly
guided and anyone who opposes them is not properly guided.