By lightly, do you mean tanks, IFVs, and VBIEDs?
You are clueless, Isis has taken Shia, Christian, and Sunni villages. Majority of forces fighting Isis in Syria and Iraq are Shia.
You don't know jack. Just stay quite. The Syria military has been attacking Isis every chance they get while the "rebels" and Isis as well as Al Nusra have conducted joint operations.
Again, you don't know jack. Syrian forces held out against Isis attacks for over 2 years at the , the T-4 airbase west of Palmyra had haulted an Isis advance and pushed them back, currently Deir-Ez zor and an important air base in the city has been under seige for years and resisting. Air bases west of Aleppo have been defending against Isis attacks as well.
Your igonorance? Yes it's funny.