I hold a different opinion in the opinion towards the scriptures reservation and completion as the piority of Islamic faith, that it indicated the reservation of the Quran as the righteous manner to reserve the purest teaching from the prehistorical scriptures. Since the strenghth of Quran is not based only on Script, as priority of the religious matter, but indeed, Scripturist could not gain proper reconcilation towards the issue between social humanity and religious humanity.
Since We know Islam is a philosophical religion, as rabbinic tradition, the knowledge and Words are very important for its meaning and derived inspiration from the chain of the origins.
However, there is different utilization for the literature in work purpose of the Creator for the true religion as Islam as well as others to be worked under the Creator permission.
In Quran it was said that, before, he give the book such as Torah and Gospel to the people for guidance. Then it commented that it is neither regards to the religion, nor the regards to the people of the script, the Allah is the most important for he has revealed. (some one please help to find verse from Quran or Hadith, I could not remember which chapter it is.)
this means that the concerns should be on the level of wisdom, prophecy, and revelation rather than the level of the religion. Therefore, from the logic of the reason for keeping the originality of of Islamic Scripture might be not proper for convincing, since their own scripture still possess the power from the creator as the Quran verses revealed below:
Those to whom We [Allah] have sent the Book [Torah] study it as it should be studied: They are the ones that believe therein: [Qur'an, sura 2:121]
"We [Allah] gave the Book [Torah] to the Israelites and bestowed on them wisdom and prophethood. We provided them with wholesome things and exalted them above the nations".[Qur'an, sura 45:17, "Kneeling"]
since the destroy of the temple divine presence from the fall of the era no matter in Babylon or in the time of the Alexander, it emphasize on the shifting Jews recognition in their religion, that was, the corruption from the divine request and resource which bear the pain of loss but headed towards the intelligence development, since the resource has been considered to be concealed, as the secret in Torah, being forcing by the creator for development consciousness of the God rather than merely divine and mystical cravings. The reason why might be due to the early development of the Christianity, which stands for the consciousness of the mystical figure Christ into consciousness rather than ancient rabbinic myth to be revealed on earth. Then Only the consciousness and intelligence development paved the way of modern Jewish development to reveal its illumination power from their traditions. I might recognize the loss and chao is other kind of bless towards Jewish script on concern on Gods revelation rather than religion itself, since it might go with time and space. Since the worship of Jews is obligatory,and to wash the wrongdoing, but their return in intelligence and illumination.
Then in Christianity, the Gospel still is the resource of the word of God, but different from rabbinic and islamic tradition, the much Guidance is from the concept of the Holy spirit (this is not trinity concept) with the following verses:
We gave Moses the Book and followed him up with a succession of messengers; We gave Jesus the son of Mary Clear (Signs) and strengthened him with the holy spirit. Is it that whenever there comes to you a messenger with what ye yourselves desire not, ye are puffed up with pride?- Some ye called impostors, and others ye slay! [Qur'an, sura 2:87]
since for Christianity, The words is the meaning, which trigger the faith that the Holy spirit straightened with, namely the path and steps of the Christ. Therefore, the faith of Christ is from Holy spirit, which associated with Baptism, the teaching and the law are with scripture and doctrine, which strength such Holy spirit. Therefore scripture working in a different way compared with Islam. Hence the worship is for the strengthening Christ power of Imposing worship for God mercy on Holy spirit and its strengthening Christ Power, their return is in mercy and forgiveness with the burden that outside of them (or laws).
It is a promise in truth which is binding on Him in the Taurat (Torah) and the Injeel (Gospel) and the Quran. And who is truer to his covenant than Allah? Then rejoice in the bargain which you have concluded. That is the supreme success. (Quran 9:111)
according to the quran, We might realize that the focus is not on religion or the people of the script, since Allah alone and his revelation is superior, namely thos covenants with Allah and his revelation through the inspiration of the scriptures he gave and rules he warned.
Then, We sent after them, Our Messengers, and We sent Iesa (Jesus) son of Maryam (Mary), and gave him the Injeel (Gospel). And We ordained in the hearts of those who followed him, compassion and mercy. But the Monasticism which they invented for themselves, We did not prescribe for them, but (they sought it) only to please Allah therewith, but that they did not observe it with the right observance. So We gave those among them who believed, their (due) reward, but many of them are Fasiqoon (rebellious, disobedient to Allah). (Quran 57:27)
there fore, we realized no matter in Christianity or in Judaism, except from the tradition, the religious figure are gradually faded, more of them are transformed into God consciousness development and Holy spirit divine inspiration movement from the traditions.
That reason why it was said that Islam is the only accepted religion to Allah referred to the righteousness of worship, as the true religion for Allah worship, with non-departed script of old and new, formed the proper ground of the Abraham branches, since the kingdom of Christ and Torah is not of this world, hence the real worship for the ground also has been carried in Islam, which might provide the spiritual unification and anchor towards both the old and new.