Question: Is the call for rapprochement between religions (Islaam – Christianity – Judaism) a legitimate one? Is it permissible for a Muslim believer to support it? I heard that this is done by some scholars in Al-Azhar and other Islaamic institutions. Is the call for rapprochement between Ahl-ul-Sunnah wal-Jamaa`ah (adherents to the Sunnah and the Muslim mainstream) and the Shiites, Druze, Al-Ismaa`iliyyah, Al-Nusayriyyah and such sects useful for Muslims?
Is reconciliation between them possible, although all of these sects entail Shirk (associating others with Allaah in His Divinity or worship), offense to the Messenger of Allah (peace be upon him), and hostility towards Islam and Ahl-ul-Sunnah wal-Jamaa`ah? Is this rapprochement permissible according to Sharee`ah?
Answer: First, the roots of Eemaan (faith) which Allaah has revealed to His Messengers in the Holy Books: Tawraah (Torah), Injeel (Gospel), Zaboor (Psalms), and the Qur’aan; and which the Messengers Ibraaheem (Abraham), Moosaa (Moses), ‘Eesaa (Jesus), and other Messengers (peace be upon them) called to, are all the same… read more here.