Earlier quoted context omitted.
They want to attack you because you are an infidel and therefore not a human. It's just rational in their caveman minds.
If that was it, why are these terrorists not attacking Armenia? Or Zambia? Or Mexico? Or pretty much anywhere in Central and South America? All those have a higher percentage of Christians in their populations than the US or anywhere in Western Europe, and they don't have the same level of anti-terrorism focus so are presumably easier targets. Could it simply be that those countries haven't been bombing and invading…
These countries have negligible numbers of Muslims.
There have been multiple Islamic terrorist attacks in Tanzania (which borders Zambia) and Kenya, both of which have significant Muslim minorities. Not to mention the frequent attacks by Boko Haram et al in Nigeria and the perpetual civil war in Somalia, which is overwhelmingly Muslim.