The Yemeni Islamic Jihad group emerged in 1992, and it is comprised of old warriors from Afghanistan.
The old warriors are Muslim. 
The article states that the group is Islamic, which is another way of saying they are Muslims. I think the system can't easily make these connections.
( z1 religious-group :name ( z2 name :op "Islam" ) :domain ( z3 warrior :mod ( z4 old ) ) )