Who told you you will be Wajib-ul-Qatal according to Salafis?? According to true Salafis (Salf literally means ancient people and by this they point to the way of Muhammad (PBUH) and his Sahabah in handling things) the way to handle things is the way I told you with wisdom and good instruction and to argue in a way that is best. If a minority of people think other wise you should not believe that this is how all believe. And this sadfully has been one of the things fed by Media and propaganda. the same how some Sunni say that Shia believe Ali was the true prophet.
Blasphemy & Apostasy are punishable by death in Saudi Arabia, even though there is no such evidence found for such an extreme measure in the Quran. Btw, Ali (R) wasn't nauzibillah a Prophet or God, & if anyone thinks that, he is not even a Muslim.