Why was the al-Qaeda terrorist organization established?

It was established in the 1980s as the Soviet Union invaded Afghanistan. It was funded by the U. S. for a while, as they were fighting communists. The late 70s invasion of Afghanistan by the Soviet Union was a proxy war between the U. S. and U. S. S. R., respectively. It was established as a group fighting against foreign invaders, and over time, it became more and more religiously centered.