What an inane question. All rebel factions are one form of Islamist or another. At different points in the war, groups of fighters moved between one faction and another.
The only faction that never bothered the Christian enclaves has been Assad's government. He is no prize either though.
There is no good faction here. The United States never had any compelling reason to back any flavor of Mohammedan theocrats who were guaranteed to be no better than Iranian theocrats.
In case you haven't clued in - the only good people in the region are the Christian enclaves (Which were damned important if you were a western worker trying to get out of the middle east in previous periods of Muslim wars) and they aren't running around attacking anyone anywhere.
What's inane is the fact that you missed the sarcasm, and that you chop off part of the sarcasm and take off on a wild tangent. But I still contend that only Juan McCain can answer the question definitively.