You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Islamism

Context:
The interpretation of Islam promoted by this funding was the strict, conservative Saudi-based Wahhabism or Salafism. In its harshest form it preached that Muslims should not only "always oppose" infidels "in every way," but "hate them for their religion ... for Allah's sake," that democracy "is responsible for all the horrible wars of the 20th century," that Shia and other non-Wahhabi Muslims were infidels, etc. While this effort has by no means converted all, or even most Muslims to the Wahhabist interpretation of Islam, it has done much to overwhelm more moderate local interpretations, and has set the Saudi-interpretation of Islam as the "gold standard" of religion in minds of some or many Muslims.

Question:
Conservative Islam classifies Muslims who follow Shia interpretation as what?

infidels