Journeyman
Where does the Bible say that the Jesus is "a completely separate being from the Father"?
First of all, how dare you to us the word "being"? PHILOSOPHY!!! ;-)
Of course they are separate persons, but I can't find where does the Bible declare them "completely separate beings". I read in the Bible that the Father and the Son are "one", which of course had to be quickly rewritten in the NWT to say that they are only "in agreement". The fact that it is a distortion of the Bible is one thing, but why would it be considered blasphemy by the Jews? Every person who takes their faith seriously feels that they are "in agreement" with God, so it's not a big deal to say so.
"If Jesus has always existed as a part of a Godhead, he could not possibly be a parallel to Adam."
Only a human can be paralleled with Adam, so this parallel says nothing about what the Son already was from the beginning, before his incarnation. Likewise, your Michael Jesus in heaven could not be compared to Adam without his incarnation. Statements about the human nature of Jesus can in no way be contrasted with his divinity.
By the way, the theology of the WTS about redemption is completely incorrect. Jesus' sacrifice is not equivalent to Adam's sin. They also falsiely put this into to NWT 1Tim 2:6. The original term (antilutron = ransom) only appears here in the New Testament and is just one of many similar expressions that describe the same redemption (Mt 20:28 lutron, Eph 1:14 apolutrosis, etc.). It cannot be claimed that a ransom - in the Bible or in the world - must necessarily be of equal value. Secondly, according to the Bible, God wants to give more than a perfect human life, even if this seems unfair in the eyes of the WTS. According to Paul (Rom 5:12-21), Adam was indeed a precursor to Jesus at a certain point: as sin entered the world through Adam and spread to everyone, so righteousness entered the world through Jesus and was given to every believer (see 5:18-19). However, he continues: "But the gift is not like the trespass (...) God's grace and the gift abounded all the more (...) where sin increased, grace abounded all the more" (5:15-16,20).
"Indeed, at death Jesus ceased to exist..."
According to the WTS yep, in the Bible I find nowhere that with his death Jesus "ceased to exist." According to the Apostolic Creed of the 1st century He "descended into the underworld" (hades), within that to Abraham's bosom. Cf. Matthew 12:40, Acts 2:24, Acts 2:31, Eph 4:9, Col 1:18, 1 Peter 3:18-19, 1Peter 4:6.
"..until his Father raised him up..."
The Bible indicates that all three Persons of the Trinity were involved in Jesus’ resurrection. Galatians 1:1 says that the Father raised Jesus from the dead. First Peter 3:18 says that the Spirit raised Jesus from the dead (see also Romans 1:4, and note that Romans 8:11 clearly says that God will resurrect believers “through His Spirit”). And in John 2:19 Jesus predicts that He will raise Himself from the dead (see also John 10:18). So, when we answer the question of who resurrected Jesus, we can say God did. And by that we can mean it was the Father, the Son, and the Holy Spirit.
“I lay down my life—only to take it up again. No one takes it from me, but I lay it down of my own accord. I have authority to lay it down and authority to take it up again.”Q.E.D.
"How could he be "among the dead" if he was a co-eternal part of a Godhead?"
So that he took on his human nature with the incarnation and will no longer put it down. Ask your bosses this question instead: how could he be "among the dead" if he completely ceased to be a human with his death, and was not actually resurrected, but was recreated, made back simply into an angel?