Was the book of Enoch once part of the holy scriptures? Jude 1:14
And Enoch also, the seventh from Adam, prophesied of these, saying, Behold, the
Lord cometh with ten thousands of his saints ...

This seems to indicate that the apostle not only read the book of Enoch but also that the apostle viewed it as actually written by Enoch. I have been wondering, was the book of Enoch respected by the apostles?
Its very likely that it was. Our modern version is questionable though. 

The modern version of Enoch that we have came from Ethiopia. In translation it may be a copy of a copy, although the Ethiopian church says the whole thing actually originated in the Ethiopian language: 

http://en.wikipedia.org/wiki/Book_of_Enoch


  The traditional belief of the Ethiopic Orthodox Church, which sees 1
  Enoch as an inspired document, is that the Ethiopic text is the
  original one, written by Enoch himself. They believe that the
  following opening sentence of Enoch is the first and oldest sentence
  written in any human language, since Enoch was the first to write
  letters:
  
  "ቃለ፡ በረከት፡ ዘሄኖክ፡ ዘከመ፡ ባረከ፡ ኅሩያነ፡ ወጻድቃነ፡ እለ፡ ሀለዉ፡ ይኩኑ"
  "በዕለተ፡ ምንዳቤ፡ ለአሰስሎ፡ ኵሉ፡ እኩያን፡ ወረሲዓን።"
  "Qāla barakat za-Hēnōk za-kama bāraka ḫərūyāna wa-ṣādəqāna 'əlla hallawu yəkūnū ba-ʿəlata məndābē la-'asassəlō kʷəllū 'əkūyān
  wa-rasīʿān"
  
  "Word of blessing of Henok, wherewith he blessed the chosen and righteous  who would be alive in the day of tribulation for the removal
  of all wrongdoers and backsliders."


Doctrinally its hard to match to the scriptures, but again this could be the result of translating a work from one language that was translated from yet another language.

There is also the question of insertions. For instance the book flows fairly well, but then a deviation is made to a strange story about Noah which differs in both delivery and believability. There are a few like this.

Enoch is a very advanced book, far beyond Revelation, layers deep in prophesy. Its quite hard to approach without questioning modern understanding of scripture, so it must be approached carefully.