ISIS are the only true Muslims as they follow the laws as outlined in the Quran. All other Muslims cherry pick from that book.
That is true. For example, when the ISIS barbarians capture female non-Muslim civilians, only the Yazidis are kept as sex-slaves. The Christians and the Jews are let-off, as they are "people of the book". This is exactly what is said in the Quran. The non-Muslim "people of the book" however have to pay the Jizya tax to the Caliphate.