6- Every Shi'ah considers the Sunnis as Muslims, but to what degree? I have heard some people say they are only Muslims by ID, and in the hereafter they shall be judged as polytheists. What's the real thing?

The Ithna 'ashari Shiah believe that every person that testifies to the Oneness of Allah and the Finality of Prophethood of Muhammad (saw), believes in the day of judgement is a muslim and a brother/sister of Islam. Therefore Shiah have no doubt about Sunni's being Muslims. Thus what is contrary to this and attributed to Shiah are fabrications of the common enemies of Muslims apprehensive of Islamic Unity.