De or het moslimterrorist?

The correct Dutch article is:

de moslimterrorist

Rule Words ending in -ist: almost always de. See the rule

How to use moslimterrorist

the moslimterroristde moslimterrorist
this moslimterroristdeze moslimterrorist
that moslimterroristdie moslimterrorist
our moslimterroristonze moslimterrorist
your moslimterroristjouw moslimterrorist
every moslimterroristelke moslimterrorist
which moslimterrorist?welke moslimterrorist?
a big moslimterrorist / the big moslimterroristeen grote moslimterrorist, de grote moslimterrorist