Well no - not really - I mean most scholars believe that Mark was the first of the canonical gospels to be completed - about 66-70CE and therefore quite possibly before the fall of Jerusalem - which would mean that Mark's version of the "Olivet discourse" was indeed prophetic. And whilst I personally find that unlikely, it is, as you say "uncertain". I don't think there is any genuine doubt about the other gospels having been written after 70CE. And even if they were, they could still (perhaps) be an accurate record of things that Jesus said long before the fall of Jerusalem. I think it is unlikely, but it is possible. And you can argue that if you like. But you cannot reasonably argue that...
I agree that Mark was most likely the first gospel written and the time frame 66 to 70 AD appears the accepted period of authorship for many scholars.
Not so - the time of the actual writing and the time of Jesus uttering the prophecy are different - we have always known that - Jesus did not record anything himself - at least not anything that has been preserved. So the question of the time of writing is not really the main issue. The issue is - as always with "revelation" - the veracity and reliability of the transmission. And that's a big problem for Baha'is because they want to reject a fair proportion of the Gospel tradition on the grounds of unreliable transmission - yes? So how can you then be so sure about the rest? That's not faith really - that's credulity. That's just swallowing the "party line" hook, line and sinker and then attempting to justify it on the grounds of "possibility".
Of course Jesus didn't write any of the Bible and it seems likely the first gospel we have was written at least 40 years after Jesus was crucified. Then to compound problems we really don't know for certain who any of the gospel writers were and it seems probable that none of them were actual witnesses to most of the events they wrote.
I don't think any of this presents a problem for Baha'is at all. Baha’is have a broad range of views when it comes to the authenticity of the gospels.
Baha'u'llah as you know spent most of His life associating with Muslims, which isn't surprising given He spent the first 35 years of His life in Persia and then the next 40 years as a prisoner or in exile throughout the Ottoman Empire. The body of His writings is huge compared with the New Testament or the Qur'an. We have many references to Christianity and to the bible. After Baha'u'llah we have Abdu'l-Baha who of course visited the West. Shoghi Effendi married a Westerner. So the Baha'i writings affirm the spiritual power and authenticity but not in the same manner as the conservative Christians.
As you know the Muslims do not think too highly of the gospels and view them as corrupted and obsolete. Baha'u'llah made a strong statement in the Kitab-i-Iqan to contradict this view.
We have also heard a number of the foolish of the earth assert that the genuine text of the heavenly Gospel doth not exist amongst the Christians, that it hath ascended unto heaven. How grievously they have erred! How oblivious of the fact that such a statement imputeth the gravest injustice and tyranny to a gracious and loving Providence! How could God, when once the Day-star of the beauty of Jesus had disappeared from the sight of His people, and ascended unto the fourth heaven, cause His holy Book, His most great testimony amongst His creatures, to disappear also? What would be left to that people to cling to from the setting of the day-star of Jesus until the rise of the sun of the Muḥammadan Dispensation? What law could be their stay and guide? How could such people be made the victims of the avenging wrath of God, the omnipotent Avenger? How could they be afflicted with the scourge of chastisement by the heavenly King? Above all, how could the flow of the grace of the All-Bountiful be stayed? How could the ocean of His tender mercies be stilled? We take refuge with God, from that which His creatures have fancied about Him! Exalted is He above their comprehension!
Bahá'í Reference Library - The Kitáb-i-Íqán, Pages 81-93
Does that mean the gospels are entirely authenticated?
Shoghi Effendi as the guardian of the faith is the authorised interpreter of the Baha'i writings. He says:
...The Bible is not wholly authentic, and in this respect is not to be compared with the Qur'an, and should be wholly subordinated to the authentic writings of Bahá'u'lláh
. (28 July 1936 to a National Spiritual Assembly)
...we cannot be sure how much or how little of the four Gospels are accurate and include the words of Christ and His undiluted teachings, all we can be sure of, as Bahá'ís, is that what has been quoted by Bahá'u'lláh and the Master must be absolutely authentic. As many times passages in the Gospel of St. John are quoted we may assume that it is his Gospel and much of it accurate.
(23 January 1944 to an individual believer)
When 'Abdu'l-Bahá states we believe what is in the Bible, He means in substance. Not that we believe every word of it to be taken literally or that every word is the authentic saying of the Prophet.
(11 February 1944 to an individual believer)
We cannot be sure of the authenticity of any of the phrases in the Old or the New Testament. What we can be sure of is when such references or words are cited or quoted in either the Quran or the Bahá'í writings.
(4 July 1947 to an individual believer)
We have no way of substantiating the stories of the Old Testament other than references to them in our own teachings, so we cannot say exactly what happened at the battle of Jericho.
(25 November 1950 to an individual believer)
Except for what has been explained by Bahá'u'lláh and 'Abdu'l-Bahá, we have no way of knowing what various symbolic allusions in the Bible mean.
(31 January 1955 to an individual believer)
The Bible
No - not really - as I pointed about above - you can have credulity - you can choose to believe it because it fits your chosen "pattern of sound teaching" (
2 Timothy 1:13) - but I think "faith" has to be built on more than that. For me at least.
My Faith is built on Baha'u'llah whose Revelation can be authenticated and whose life is well recorded by many sources.