How can a Madrassa create the Mujahideen?
Madrassa is merely the place for indoctrination of children and other youths alike. Similarly these madrassa's were run by JI and JUI throughout Pakistan with the help of our security establishment, they used them to recruit youngsters for their cause and then sent them for training to camps in the northern areas of Pakistan.
The Mujahideen were trained in the northern areas of Pakistan at training camps created by ISI, these camps used to have military experts from a host of countries including China, Egypt, Saudi Arabia and more.
Also how can you convert someone into a Mujahideen?
Mujahideen basically means a struggler: Mujahid meaning 'to struggle'.
Similarly, some of these Mujahideen were being armed and trained by our Army even before the Soviet invasion of Afghanistan. It was part of Bhutto's doctrine to arm Islamists in order to counter the PDPA in Afghanistan.
The favorite of that time was the extremist Hekmatyar.
The Taliban are majority Deobandi, not Wahabi, only the foreigners Arabs amongst their allies are Wahabi/Salafi.
Pakistan played the most vital role in creating these Mujahideen.