Shaykh Saalih al-Fawzaan (may Allaah preserve him) stated:
"Anyone who opposes the group of Ahl as-Sunnah are astray. We do not have except for one Jamaa'ah and they are Ahl as-Sunnah. That which opposes this Jamaa'ah it is opposition to the methodology of the Messenger (sallallaahu alayhi wa sallam). Everyone who opposes Ahl as-Sunnah wal Jamaa'ah is from the people of desires. The oppositions differ in their ruling in relation to (the opposer) being declared astray or being declared a disbeliever. This is according to the greatness or smallness of the opposition as well its distance and nearness to the truth. Everyone who opposes Ahl as-Sunnah wal Jamaa'ah from those who attribute themselves to al-Islaam in the affair of ad-Da'wah (calling to Allaah) or Aqeedah (Islaamic creed) or anything in the foundations of faith, indeed he enters into seventy two groups ( of deviance). Also the threat (of being in the hell-fire) includes him and for/upon him is blame and punishment according to the degree of his opposition."
Source: Al-Mu'een Li Tawdeeh Ma'aani Athar Ibn Seereen - By Shaykh Ahmad Baazmool (may Allaah preserve him) pgs. 89-90
Sisters Upon Al-Istiqaamah