There is no Salvation Except through Faith in the Qur'an

"Say (O Muhammad ) "O people of the Scripture (Jews and Christians)! You have nothing (as regards guidance) till you act according to the Taurat (Torah), the Injeel (Gospel), and what has (now) been sent down to you from your Lord (the Qur'an)." Verily, that which has been sent down to you (Muhammad ) from your Lord increases in many of them their obstinate rebellion and disbelief. So be not sorrowful over the people who disbelieve." (Qur'an 5 : 68)

By 'establishing the Torah and the Gospel' is meant observing them honestly and making them the law of life.

It should be noted here that the Scriptures which comprise the Bible consist of two kinds of writings. One was composed by the Jewish and Christian authors themselves. The second consists of those portions which have been recorded as either the injunctions of Allah or as the utterances of Moses, Jesus and other Prophets. Such portions are those in which it has been categorically stated that Allah said so and so, or that a particular Prophet said so and so. If we were to exclude the portions belonging to the first category and carefully study those belonging to the second we would notice that their teachings are not perceptibly different from those of the Qur'an. It is true that the second category has not altogether escaped the tamperings of translators, scribes and exegetes, and the errors of oral transmitters. Nevertheless, one cannot help feeling that the teachings embodied in the second category call man to the same pure monotheism as the Qur'an, that they propound those very beliefs propounded by the Qur'an and that they direct man to the same way of life as that to which the Qur'an seeks to direct him. Hence, had the Jews and the Christians adhered to the teaching attributed in their Scriptures to Allah and the Prophets they would certainly have become a truth-loving and truth-oriented group of people and would have been able to see in the Qur'an that very light which illuminates the earlier divine Scriptures. There would then have been no question of their abandoning their religion in order to follow the Prophet (peace be on him). To follow him would have caused neither break nor discontinuity; they would simply have gone one stage further along the same road.

Instead of reflecting on this seriously and dispassionately, they were seized by a fit of intransigence which intensified their opposition.

Allah says: O Muhammad, say,

(O People of the Scripture! You have nothing...) meaning no real religion until you adhere to and implement the Tawrah and the Injil. That is, until you believe in all the Books that you have that Allah revealed to the Prophets. These Books command following Muhammad and believing in his prophecy, all the while adhering to his Law. Before, we explained Allah's statement,

(Verily, the revelation that has come to you from your Lord makes many of them increase in rebellion and disbelief.)

(So do not grieve for the people who disbelieve), Do not be sad or taken aback by their disbelief. Allah said next,

(Surely, those who believe) referring to Muslims,

(those who are the Jews) who were entrusted with the Tawrah,

(and the Sabians. ..) a sect from the Christians and Magians who did not follow any particular religion, as Mujahid stated. As for the Christians, they are known and were entrusted with the Injil. The meaning here is that if each of these groups believed in Allah and the Hereafter, which is the Day of Judgement and Reckoning, and performed good actions, which to be so, must conform to Muhammad's Law, after Muhammad was sent to all mankind and the Jinns. If any of these groups held these beliefs, then they shall have no fear of what will come or sadness regarding what they lost, nor will grief ever affect them. We discussed a similar Ayah before in Surat Al-Baqarah (2:62).

Had the People of the Book Adhered to their Book, they Would Have Acquired the Good of this Life and the Hereafter; pt2

"And if only they had acted according to the Taurat (Torah), the Injeel (Gospel), and what has (now) been sent down to them from their Lord (the Qur'an), they would surely have gotten provision from above them and from underneath their feet. There are from among them people who are on the right course (i.e. they act on the revelation and believe in Prophet Muhammad  like 'Abdullah bin Salam ), but many of them do evil deeds." (Qur'an 5 : 66)

In the Old Testament, Leviticus (chapter 26) and Deuteronomy (chapter 28) record a sermon of Moses in which he impresses upon Israel, in great detail, the bounties and blessings of Allah with which they would be endowed if they obeyed His commandments, and the afflictions, scourges and devastations that would descend upon them if they disobeyed Him and rejected the Book of Allah. That sermon of Moses is the best explanation; from a Christian standpoint, of this verse of the Qur'an.

Allah Mentions `Isa and Praises the Injil

"And in their footsteps, We sent 'Iesa (Jesus), son of Maryam (Mary) , confirming the Taurat (Torah) that had come before him, and We gave him the Injeel (Gospel), in which was guidance and light and confirmation of the Taurat (Torah) that had come before it, a guidance and an admonition for Al-Muttaqun (the pious." (Qur'an 5 : 46)

Allah said,

(and We sent...) meaning, We sent

(in their footsteps) meaning the Prophets of the Children of Israel,

(`Isa, son of Maryam, confirming the Tawrah that had come before him,) meaning, he believed in it and ruled by it.

(and We gave him the Injil, in which was guidance and light) a guidance that directs to the truth and a light that removes the doubts and solves disputes,

(and confirmation of the Tawrah that had come before it,) meaning, he adhered to the Tawrah, except for the few instances that clarified the truth where the Children of Israel differed. Allah states in another Ayah that `Isa said to the Children of Israel,

(. ..and to make lawful to you part of what was forbidden to you.) So the scholars say that the Injil abrogated some of the rulings of the Tawrah. Allah's statement,

(a guidance and an admonition for those who have Taqwa.) means, We made the Injil guidance and an admonition that prohibits committing sins and errors, for those who have Taqwa of Allah and fear His warning and torment. Allah said next,

(Let the people of the Injil judge by what Allah has revealed therein.) meaning, so that He judges the people of the Injil by it in their time. Or, the Ayah means, so that they believe in all that is in it and adhere to all its commands, including the good news about the coming of Muhammad and the command to believe in and follow him when he is sent. Allah said in other Ayat

(Say "O People of the Scripture! You have nothing (guidance) until you act according to the Tawrah, the Injil, and what has been sent down to you from your Lord.'') and,

(Those who follow the Messenger, the Prophet who can neither read nor write whom they find written with them in the Tawrah...) until,

(...successful.) Here, Allah said,

(And whosoever does not judge by what Allah has revealed, such are the rebellious.) meaning, the rebellious and disobedient of Allah who prefer falsehood and abandon truth. We mentioned before that this Ayah was revealed about the Christians, and this is evident from the context of the Ayah.

So clearly we recognize the Messiah did not expound a new religion. That very religion which had been the religion of all the Prophets was also his religion, and it is towards that religion that he called people. He believed in the true teachings of the Torah which were extant in his time, and the Gospels (Injil) confirm this (see, for example, Matthew 5: 17-18). The Qur'an repeatedly stresses the fundamental fact that none of the Prophets of Allah, no matter in which part of the world they appeared, denied the Prophets who had preceded them. On the contrary, each Prophet confirmed the message of his predecessors and sought to promote the mission which was the sacred legacy of them all. Allah did not reveal any of the Books in order to repudiate the previous ones; each confirmed and supported the preceding ones.