As far as pork/question #1, there is simply this statement:
"The eating of pork is not forbidden in the Bahá'í Teachings."
(From a letter written on behalf of Shoghi Effendi to an individual believer, March 27, 1938)
One Muslim (who later became a Baha'i) observed that this does not mean that pork is encouraged, simply that the law has changed to not forbid it.
I understand there may be a Tablet from Baha'u'llah about why it was forbidden before, but I have not seen it myself. Some have speculated that pork was disallowed due to the lack of knowledge at the time of trichinosis, etc.
As far as question #2 on the Bible, Baha'u'llah explained that most of the references in the Qu'ran to the Bible being corrupted, except in a few rare cases, referred to the text being misinterpreted. He argued that if the Bible did not mostly convey the Divine teachings faithfully, and that failing to have a Holy Book for all that time would be contrary to God's mercy (I recall that another argument may have been given in our Writings about the fact that the absence of such a text would not allow them to be held to account on the Judgment Day brought by the Revelation of the Qur'an). Baha'u'llah discusses this in paragraphs 91-98 of the Kitab-i-Iqan, His most important doctrinal work. However, we do not believe that the Bible is 100% accurate:
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 Baha'u'llah."
(From a letter dated July 28, 1936 written on behalf of Shoghi Effendi to a National Spiritual Assembly at http://bahai-library.com/file.php?file= ... pensations )
As far as the Zoroastrian, Buddhist and Hindu scriptures, there is this compilation (if you want one in detail on Buddhist scriptures, there is this one.) Basically, we believe that while some prophecies and teachings have been preserved, much has been lost and in some cases are contrary to their original teachings.
As far as question #3/on angels and jinn:
"Regarding your question as to the meaning of Jin or Genii referred to in the Qur'an, these are not beings or creatures that are actually living, but are symbolic references to the power of men of evil and may be likened to evil spirits. But the point to bear in mind is that these have no positive existence of any kind."
(From a letter written on behalf of the Guardian to an individual believer, June 26, 1936: Bahá'í News, No. 105, p. 1, February 1937)
Angels are seen similarly: as being symbolic of holy beings, though we also believe that they can refer to beings in the next world who are, unlike Jinn, granted the power by God to positively influence the goings-on in this world.
As far as the second part of question #3 on God revealing the Qu'ran through the Angel Gabriel, yes we believe that God has marked the beginning of the Messengers' Revelations with such a symbolic representation. You can see a few references in the Baha'i Writings which refer specifically to Gabriel or you can also read on the symbolic nature of such occurrences (also here), in this context explaining how the Dove which appeared to His Holiness Jesus Christ was a spiritual state, not a material form.
As far as question #4 on the Son of God, we uphold both the Qur'an which maintains that God can have no sons or daughters, as well as the title of Jesus as the "Son". Our Writings explain the difference, indicating that the Qur'an was objecting to the sometimes almost literal/corporeal belief of some Christians that God really had a physical son.
It is true that Jesus referred to Himself as the Son of God, but this, as explained by Bahá'u'lláh in the Iqan, does not indicate any physical relationship whatever. Its meaning is entirely spiritual, and points out to the close relationship existing between Him and the Almighty God. Nor does it necessarily indicate any inherent superiority in the station of Jesus over other Prophets and Messengers. As far as their spiritual nature is concerned all Prophets can be regarded as Sons of God, as they all reflect His light, though not in an equal measure, and this difference in reflection is due to the conditions and circumstances under which they appear."
(From a letter written on behalf of the Guardian to an individual believer, November 29, 1937)
As far as question #5 on the crucifixion, there is this:
"Regarding your question relative to Surih 4, 156 of the 'Qur'an' in which Muhammad says that the Jews did not crucify Jesus, the Christ, but one like Him; what is meant by this passage is that although the Jews succeeded in destroying the physical body of Jesus, yet they were impotent to destroy the divine reality in Him."
(From a letter written on behalf of the Guardian to an individual believer, March 19, 1938 at http://bahai-library.com/?file=hornby_l ... er=4#n1669 )
The crucifixion as recounted in the New Testament is correct. The meaning of the Qur'anic version is that the spirit of Christ was not crucified. There is no conflict between the two."
(From a letter written on behalf of Shoghi Effendi to an individual believer, July 14, 1943, at http://bahai-library.com/?file=hornby_l ... er=4#n1646 )