How could #1 be true? All ISIS members aren't Muslims and also sunnis are who follow correctly. You think killing muslims, non-muslims and making mischief in the lands are Sunnis? I don't think so.
Do you have any proof for this? As far as I know, there isn't a single non-Muslim member in the ISIS. Also, I don't think there are any Shias or Ismailis with them.