First of all, you are wrong. Irelands - Sinn Fein is a terrorist group, look it up... you might also want to look up Baadar meinhoff - RAF (Red Army Faction) of germany.
Second of all, People, Groups, are judged on their actions.
If you go around murdering innocent people to achieve your political goals, you are a terrorist. Hence why FSA ARE terrorists!!
If they did not kill innocent civilians to further their political and ideological aspirations, i would be calling them freedom fighters.
Now, you do not see Christian religious extremists running around Syria slicing peoples throats, shooting whole families, and then trying to blame it on the government, to try to garner more support internationally to further their political and ideological aspirations.
this you cannot deny!!
You cannot escape the facts, The groups fighting Assad, are muslim.. they are not christians, they are not buddist, they are not hindu etc. They are muslims, and instead of going through proper channels to overthrow the syrian regime, they resort to Extremes. Hence they ARE islamic extremists! true? they cannot be called anything different.
There are muslims within Syria who support the syrian government still, true?? some dont take either side. i realise this, and therefor i am not generalising at all.
actions speak louder then words, and FSA has done a lot of talking, but their actions paint a whole different picture.