1) Did Jesus come to inaugurate His earthly kingdom? Nope, that happens when He returns.
Jesus has not inaugurated his kingdom yet and it is 2000 years later. If he did it today then no one would say it is is what Jesus meant by his kingdom being at hand when he came lest they be counted as a fool. Jesus said all during his ministry until the last days of his earthly ministry that his kingdom was at hand and that it was good news and glad tidings. Obviously he intended to leave for a while and return because those who had believed his gospel would have had to receive his Spirit from God the Father in heaven and be born again and when all the citizens of his nation were born again, he would return as King over all the earth like the prophets said. Jesus said in John 14 that if he did not leave the Spirit would not come.
11 And as they heard these things, he added and spake a parable, because he was nigh to Jerusalem, and because they thought that the kingdom of God should immediately appear.
12 He said therefore, A certain nobleman went into a far country to receive for himself a kingdom, and to return.
13 And he called his ten servants, and delivered them ten pounds, and said unto them, Occupy till I come.
14 But his citizens hated him, and sent a message after him, saying, We will not have this man to reign over us.
They were given a stewardship while he was gone.
15 And it came to pass, that when he was returned, having received the kingdom, then he commanded these servants to be called unto him, to whom he had given the money, that he might know how much every man had gained by trading.
27 But those mine enemies, which would not that I should reign over them, bring hither, and slay them before me.
28 And when he had thus spoken, he went before, ascending up to Jerusalem.
Watch this after the resurrection of Jesus Christ and try to understand that God has shown us that not only does he consider Israel as the sons of Abraham individually but he considers them as the son of God collectively and this son must be born again collectively. This is why the parable I quoted above says he will kill them who are not in favor of his earthly kingdom when he returns. This is the reason Jesus says "a man" must be born again in order to enter the kingdom in the passage I quoted in John 3. This man is his son collectively who were born of the flesh but not yet born of the Spirit. You may read in Ex 4 to read Jesus calling Israel collectively his firstborn son. To keep the post from being too long I will quote two other passages in the Acts to confirm what I am telling you.
Ac 2:36 Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ.
37 Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?
38 Then Peter said unto them, Repent, and be baptized
every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
I have underlined the operative command to this nation. There will be no physical kingdom until every Israel citizen is saved through faith in the death, burial, and resurrection of Jesus Christ and has the Spirit dwelling in them.
Notice this and please read the whole context;
Acts 3:18 But those things, which God before had shewed by the mouth of all his prophets, that Christ should suffer, he hath so fulfilled.
19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;
20 And he shall send Jesus Christ, which before was preached unto you:
21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
22 For Moses truly said unto the fathers, A prophet shall the Lord your God raise up unto you of your brethren, like unto me; him shall ye hear in all things whatsoever he shall say unto you.
23
And it shall come to pass, that every soul, which will not hear that prophet, shall be destroyed from among the people.(Remember the parable from Matthew that I quoted about Jesus going to the Father to get his kingdom and returning and killing those who would not submit to his rule)
24 Yea, and all the prophets from Samuel and those that follow after, as many as have spoken, have likewise foretold of these days.
25 Ye are the children of the prophets, and of the covenant which God made with our fathers, saying unto Abraham, And in thy seed shall all the kindreds of the earth be blessed.
26 Unto you first God, having raised up his Son Jesus, sent him to bless you, in turning away
every one of you from his iniquities. (The underlined is the operative phrase in this passage.
The scriptures are logical, reasonable, and true but they require believing the words in order to learn them.
I will deal with these other of your points as we move on.
2) When will Jesus reign from David's throne? When He returns.
3) "All Israel" will be comprised of all born anew believers, both believing blood line Jews and believing non-blood line Jews (Gentiles).
4) Learnings that impact our understanding of how people are being saved are discerned from reading and studying scripture with an open mind, not blinded by presuppositions.
5) The spiritual kingdom of God (Heaven) is at hand, now and since Christ began His public ministry.
6) The earthy kingdom of God will be inaugurated when Christ returns.[/QUOTE]