Islam was introduced into Afghanistan in approx 650.AD
The Crusades are linked first to the speech of Pope Urban II in 1095, and the First Crusade took Jerusalem in 1099. The real hatred between the Christians and Muslims didn't really begin until the Second and Third Crusades around the , and the later Counter Crusades under Zengi and Salah ed-Din.
Afghanistan became a center of Islamic power and Culture under the Ghaznavid Dynasty around 900-1100.AD, until the Islamic power base later moved to Egypt not long after the failure of the Seventh Crusade.
Late 20th Century Islamic extremism has bugger all to do with the Crusades.
Tronsky