Qur’an includes instructions for its own preservation, protection, no modernization.
The previous scriptures [Torah, Psalms and Gospel] could not remain in original revealed form. Qur’an being the last and final book for the guidance of mankind, has to be preserved till eternity: “Nay, but this [divine writ] is a discourse sublime, upon an imperishable tablet [inscribed]” (Qur’an;85:21-22). “No falsehood can ever attain to it openly, and neither in a stealthy manner, [since it is] bestowed from on high by One who is truly wise, ever to be praised” (Qur’an;41:42). God has himself taken responsibility to protect it against corruption: “We have without doubt sent down the Message; and We will assuredly guard it (from corruption)”(Qur’an;15:9). This prophecy has been strikingly confirmed by the fact that the text of the Qur’an has remained free from all alterations, additions or deletions ever since it was enunciated by the Prophet in the seventh century of the Christian era; and there is no other instance of any book, of whatever description, which has been similarly preserved over such a length of time.
As far as modernization of Qur’an is concerned, such a thought can only come in to the mind of atheist. God is Omnipotent (Geneses17:1; Exodus;6:3, Qur’an;6:61), Omniscient (Psalms;139:1-6; Proverbs;5:21, Qur’an;60:10). He knows well every thing of past, present and future, so His final message shall encompass requirements of all the times. Qur’an does not need any modernization. The books written by human being need to be updated not the Last Testament by Divine. The fundamental doctrines of Qur’an like Oneness of God, Resurrection, trial on Day of Judgment, Metaphysics, eschatology and other fundamentals of Faith are for ever. Similarly the 5 pillars of Islam [worship modes] remain unchanged for ever. However to cater for aspects not clearly mentioned in Qur’an and Sunnah [Traditions of Prophet (pbuh)] can be resolved through Ijtehad [analogy] explained above. The Christians, first discarded the Law, preached and practiced by Prophet Jesus Christ, The son of Mary (peace be upon him): “And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, commits adultery: and whoso marries her which is put away doth commit adultery”(Matthew;19:9);“You have heard that it was said by them of old time, You shall not commit adultery: But I say unto you, That whosoever looks on a woman to lust after her has committed adultery with her already in his heart.”(Matthew;5:27-28). They continue to discard and ignore even the moral other teachings of Paul in in New Testament: “Know you not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor male prostitutes nor homosexuals offenders, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God” (1Corinthians;6:9-10). On the pretext of moderation the Christendom continue to discard the basic moral teachings of the scripture they claim to believe, but such a proposition is unacceptable to the Muslims.