First, I would appreciate it if we could agree on a translation other than the NWT.
On to the doctrines; I would appreciate the full Scriptural basis for the following doctrines. You may take as much time on each point as you feel you need to and consider any information you want in arriving at an answer, but I would prefer it if the answer is from the Scriptures.
(1) Christian Elders have a responsibility to judge wrongdoers from within the congregation, mete out sentences, and act as executioners in private trials that cannot be recorded or witnessed by others. (1 Timothy 5:20)
(2) The Governing Body has authority over the faithful and discreet slave, instead of the other way around. (Matthew 24:45-47)
(3) Adam and Eve were created capable of living forever without first having to eat of the fruit of the tree of life. (Genesis 3:20-24)
(4) Jerusalem had to be destroyed for the 70 years to be fufilled. (Jeremiah 27:8-18)
(5) A group that was actively doing what Jesus warned people away from following, is the organization Jesus would choose as his representatives. (Matthew 24:23-28; Luke 17:22-30; Mark 13:21-23)
The importance of each of these doctrines to Jehovah's Witnesses authority structure and belief system is likely readily apparent to you. Since the importance may not be clear to others, I will provide a very brief synopsis of the impact of each.
(1) If elders did not have closed door meetings, or made the meetings recordable, or allowed witnesses to the proceedings, they could be held legally accountable for what they say and do, or fail to say and do. In other words, they are free to break Caesar's law behind closed doors in ways they would not be able to do with witnesses present. Recording should be permitted for the exact same reason that recordings are permitted when police interrogate a prisoner, for accountability. Even the Sanhedrin did not exclude witnesses to the proceedings.
(2) If the faithful and discreet slave has been correctly identified, then they have authority over all Christ's belongings. QED, if they do not have authority over something then that something doesn't belong to Christ. The faithful and discreet slave, as identified, has no discernible authority over anything as a class.
(3) If Adam was not capable (as a perfect human) of living forever without eating the fruit of the tree of life, then Jesus was not. Which means their entire doctrine about Jesus death and the ransom is seriously flawed, not to mention the certainty of their doctrine regarding the "original purpose" for the earth.
(4) Jerusalem did not need to be destroyed. The Bible directly states that the city did not have to be devastated. Reading Jeremiah 25 and 27 along with Daniel 5 gives a VERY different picture of the 70 years than that portrayed by most references from the Society.
(5) It is obvious that Jesus would not warn people to avoid those who he would choose as his representatives, yet at the time Jesus is supposed to have chosen the Bible Students (1919) they were actively doing exactly what he told people not to believe, heralding Christ's presence, saying they knew Jesus' location, prophesying falsely about 1925 (while claiming the chronology had God's stamp of approval and claiming the dates were God's dates, not their own), and announcing that the time was at hand. The main release at the 1975 District Convention was titled "Man's Salvation Out of World Distress At Hand!" Compare Luke 21:8 in the American Standard Version (ASV) "And he said, Take heed that ye be not led astray: for many shall come in my name, saying, I am he; and, The time is at hand: go ye not after them."
I am hopeful that you will try to answer to these points of dogma, using only the Scriptures as your authority. In fact, if you do, I personally promise not to argue with your Scriptural responses—so long as your arguments are directly Scriptural and don't require sophistic reasoning or human interpretation to make your points. I don't think you have a great chance of being able to answer even one by using only the Scriptures, but I look forward to reading what you come up with.
In fact, I welcome any lurkers or other posters to try Scripturally supporting these doctrines.
Respectfully,
AuldSoul