You really don't seem to understand this do you.
The majority of the Opposition is Islamists, Islamists don't listen to anyone but Allah and follow only the Sharia (which would be called "Islamic Democracy" in "Western Terms.")
Syrians will win with or without the support the US, the question is when. With the US's support, the war can end much quicker. And if both sides received support from no one, Assad would've been gone in 2012.
Libya won't become better in an instant. Considering most of the armed groups had a fragile unity. In Syria, most of the groups of the opposition are in the SRCC (minus Nusra), in which they agreed to politically and militarily co-operate. Egypt won't have any democracy until they have a civil war, because the Egyptian Army controls something like 62% of the wealth and land of the country, which they won't give up easily.