@lonest! there are two Islamic sources: the Qur'an and the authentic Hadith.

The Qur'an is the Word of Allah, purely the words of Almighty God, 100%. While the Hadiths are the authentic collection of narrations i.e. the words, actions or sayings of the prophet Muhammad (pbuh).

There are two categories of hadiths:
1. Saheh (authentic) - these are accepted narrations
2. Hasan (“fair, sound, single-chained hadith”) - narrations that have been graded good

There is another category, which is rejected:
3. Dhaif (weak) - classified as weak, fabricated narrations and not accepted. Such hadith is made up and is unreliable and/or is a lie

Why are hadiths considered weak? There are many reasons:
- if one of the narrators was known to have a weak memory
- there is no flowing of narrators i.e. if there is a break in narrations
- if any of narrator cannot be trusted

What about the authentic hadiths?
- if 10 or more chain of narrators
- there was flowing of narration
- if the narration has same meaning of content

Saheh hadiths have been compiled by Bukhari
And some of "fair" hadiths by Tirmidhi.
While weak hadiths are totally rejected.

Before we get to the "ancient manuscripts",let us begin by noting that you have been quoting the Bible.Which book have you been using and why? It will clarify why, when and which book is appropriate for use by your standards.

On the issue of authenticity,how authentic is @guru's post and my reply here.

And [for] their saying, "Indeed, we have killed the Messiah, Jesus, the son of Mary, the messenger of Allah ." And they did not kill him, nor did they crucify him; but [another] was made to resemble him to them. And indeed, those who differ over it are in doubt about it. They have no knowledge of it except the following of assumption. And they did not kill him, for certain.

Which truth doesn't a Muslim know?

@muriel, you said yours is 'faithful' to "ancient manuscript". Please go ahead and tell me which one you have.