The Bible's vs the Quran's challenge

Allah, in the Quran, challenges anyone to produce a book like it (17:88), nor ten chapters like it (11:13), nor even one chapter like it (2:23, 10:38).

God, in the Bible, also posed challenges. He challenge anyone to foretell the future.
Set forth your case, says the LORD; bring your proofs, says the King of Jacob. Let them bring them, and tell us what is to happen. Tell us the former things, what they are, that we may consider them, that we may know their outcome; or declare to us the things to come. (Isaiah 41:21-22 ESV)
Who is like me? Let him proclaim it. Let him declare and set it before me, since I appointed an ancient people. Let them declare what is to come, and what will happen. (Isaiah 44:7 ESV)
I am telling you this now, before it takes place, that when it does take place you may believe that I am he. (John 13:19 ESV)

Muslims reasons for a miraculous Quran

These are some of the reasons Muslims offered to prove that the Quran is miraculous:

• Its content is beyond Muhammad and his contemporaries;
• It was revealed in Arabic, the most precise and logical language in the world;
• It has unique linguistic and literary features;
• It was revealed in 23 years and yet has no contradiction;
• Muhammad’s illiteracy prevent him from producing such a book;
• No one is able to produce a book like it, nor ten chapters like it, nor even one chapter like it;
• Its exact preservation till today.

Allah sent messengers to every nation

Allah sent messengers to every nation:
And for every Ummah (a community or a nation), there is a Messenger; when their Messenger comes, the matter will be judged between them with justice, and they will not be wronged (10:47 Muhsin Khan version).
Verily! We have sent you with the truth, a bearer of glad tidings, and a warner. And there never was a nation but a warner had passed among them (35:24 Muhsin Khan version).

It was not stated whether these messengers wrote books, but anyway, the messages were lost.

Allah claimed to have given us the Bible

Allah claimed to have given us the Bible.
Say, [O believers], "We have believed in Allah and what has been revealed to us and what has been revealed to Abraham and Ishmael and Isaac and Jacob and the Descendants and what was given to Moses and Jesus and what was given to the prophets from their Lord. We make no distinction between any of them, and we are Muslims [in submission] to Him." (2:136 Sahih International version).
Say, "We have believed in Allah and in what was revealed to us and what was revealed to Abraham, Ishmael, Isaac, Jacob, and the Descendants, and in what was given to Moses and Jesus and to the prophets from their Lord. We make no distinction between any of them, and we are Muslims [submitting] to Him." (3:84 Sahih International version).
Indeed, We have revealed to you, [O Muhammad], as We revealed to Noah and the prophets after him. And we revealed to Abraham, Ishmael, Isaac, Jacob, the Descendants, Jesus, Job, Jonah, Aaron, and Solomon, and to David We gave the book [of Psalms]. (4:163 Sahih International version).

They are the Taurat (Torah), Zabur (Psalms) and Injil (Gospel). If we read the Bible, we find that the Taurat (Torah), Zabur (Psalms) and Injil (Gospel) are very different from the Quran.

For example, in the Quran, Jesus did not die:
And because of their saying (in boast), "We killed Messiah 'Iesa (Jesus), son of Maryam (Mary), the Messenger of Allah," - but they killed him not, nor crucified him, but the resemblance of 'Iesa (Jesus) was put over another man (and they killed that man), and those who differ therein are full of doubts. They have no (certain) knowledge, they follow nothing but conjecture. For surely; they killed him not [i.e. 'Iesa (Jesus), son of Maryam (Mary) ]: (4:157 Muhsin Khan version)

In all the four Gospels of the Bible, Jesus died and rose again on the third day. So the Injil (Gospel) that the Quran talked about is a different gospel from the Gospel in the Bible. Did the Injil (Gospel) of the Quran exist? It is the job of the Muslims to produce this Injil (Gospel). I definitely think it does not exist. Show me and I will believe.

The Quran is preserved but not the Taurat, Zabur and Injil

Allah had promised in the Quran to protect and preserve the Quran.
Indeed, it is We who sent down the Qur'an and indeed, We will be its guardian (15:9 Sahih International version).

Allah promised that his words cannot be changed.
For them are glad tidings, in the life of the present world (i.e. righteous dream seen by the person himself or shown to others), and in the Hereafter. No change can there be in the Words of Allah, this is indeed the supreme success (10:64 Muhsin Khan version).

However, Allah failed to preserve the Taurat (Torah), Zabur (Psalms) and Injil (Gospel). We cannot find the version of Taurat, Zabur and Injil that is in agreement with the Quran today. The three books were so thoroughly destroyed that we cannot even find the evidence that it ever exist. All we have is the Bible, which the Muslims claimed (without proof) that it is not the real Taurat, Zabur and Injil.

Given the track record of three failures, how can I trust Allah to preserve the fourth?

To prove the Quran

There are 4 verses in the Quran that give a method of proving that the Quran is true. There are quoted below in Sahih International version:

And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah , if you should be truthful. (2:23)

Or do they say [about the Prophet], "He invented it?" Say, "Then bring forth a surah like it and call upon [for assistance] whomever you can besides Allah , if you should be truthful." (10:38)

Or do they say, "He invented it"? Say, "Then bring ten surahs like it that have been invented and call upon [for assistance] whomever you can besides Allah , if you should be truthful." (11:13)

Say, "If mankind and the jinn gathered in order to produce the like of this Qur'an, they could not produce the like of it, even if they were to each other assistants." (17:88)

Basically the Quran challenge us to bring a book or a chapter like it. To accept this challenge, we can conduct a test. Create Arabic verses like the Quran and mix the real Quran surahs in it. Get those who know Arabic to identify the real Koran surahs. If everyone who reads this mixture is able to correctly identify the real Quran surahs, then the Quran must be special. If not, we can prove that the Quran can be duplicated and the above quoted surahs are false.

Can principals and teachers be evaluated fairly with yearly KPI?

Let say a new principal of a prestigeous top secondary school or junior college decide to try some new methods to train the students. As a result, the school's results drop a little, maybe no longer top, but still within top ten. After five years, the school's board call up the principal and said, "Ever since you took over, our school is no longer the best. Although we know that you emphasise on training the whole person, not just for academic results, but our school ranking has dropped and so you have to go. Maybe you should go to those school where the students are not so gifted and try your methods." Let say twenty years later, it turned out that most of the leaders of the country turned out to be from that school during the principal's term of office and they credit their success to him (or her). How shall we reward this principal, since the proof of his success takes twenty years to mature?