During the 1980s Muhammed Omar, joined the Afghan mujahideen in their war against the Soviet Union and the Democratic Republic of Afghanistan.
He founded the Taliban movement in 1994.
First off, CIA funding dwindled to nearly nothing years before the Taliban even came into existence (and was funneled through Pakistan). So if you're trying to say the U.S. directly armed the Taliban, you're wrong (as usual).
The Taliban was formed by Pashtun clerics and students, some of which were in the Mujahedeen at some point in time, but had become disillusioned in the control of Afghanistan by the actual former Mujahedeen warlords. Substantial rank and file came from the students in the schools. The Pakistani's and the Saudi's created the Taliban, they just happened to have a leader with Mujahideen ties.
In fact the new Mujahideen now resists the Taliban in Panjshir.