“They ARE the opposition. The only opposition in Syria IS Islamist.”
That is a patently FALSE accusation. You know nothing of which you post.
In the least read the Wikipedia article on the war. The war was started by secular Syrians composed of Christians, Allewites and non-Islamic Sunnis. They formed the original opposition group, the FSA. The Islamist groups, such as ISIS are a separate breed which seek to subjugate and or dominate the secularists.
Sure, 4 years ago.
These folks are non-factors now. Half of them ran to Europe, the other half are hunkered down, at best.