Wrong! The Taliban are the exact same people that the US & Saudi Arabia through Pakistani ISI armed and trained to fight against pro-Soviet Afghans. They only got a new name/designation which in Pashto means "students"
Among those trained and armed by US/Saudi/Pakistani ISI was Mullah Omar, which would eventually become the leader of the Taliban.
Beyond wrong! Quite the opposite! The "Norther Alliance" were the "remnants" of the pro-Soviet Afghans!
It's precisely this group that the US fought against using Islamist radicals that it trained, armed and financed with the help of Pakistan!
It's fairly easy to find all kind of details, but it should be pretty obvious from the outset that the pro-Soviets would likely be more secular, while the ones that got funded by the Americans and Saudis would very likely be radical Islamists - as this is what the Saudis seek to promote(Wahhabism). There are not enough secularists in that part of the world to find two groups that would fight against one another.
The US has a long history of using all kinds of radicals, terrorists, dictators, and so on, then at some later time, they'll switch sides and back-stab them(provided Saddam with chemical weapons under dual use to used them against Iranians, then turned on him; used Iranians to fund the Contras; used Noriega then turned on him; helped Gaddafi kidnap dissidents, then turned on him; etc etc)
ps. the same is true for the "secular rebels" sponsored by the US in Syria - nearly all of them are radical Wahhabis .. about the only somewhat secular group in Syria is the one Assad belongs to - but that's politically inconvenient!