Before going into these, again, the language of 'changes' by you begs the question - if they were added, then the doctrinal changes are in fact the other way around.
Hey, look. I see a pattern of bad things and not a pattern of good things. These things ARE IMPORTANT. I believe the Trinity, Waling after the Spirit so as not to be under the Condemnation, fasting to cast out stronger demons, and be separate from those who think Godliness is gain to be very important things as a a part of my faith in God's Word. Without these teachings, the Word of God is changed.
This is hardly an important doctrine -
Uh, there is no doctrine in the Bible that is not important. In fact, try telling that to the Christian who has a wrong Modern Bible in another third world country who has been struggling to cast out stronger demons within a particular child that they care for and love.
there has never been any great argument in the church on the doctrines surrounding demonology.
Written man made documents are not inspired and they cannot be proven to be true. People can have false agendas. So placing your faith in man made documents instead of the Word of God is a false premise.
But, again, in several early manuscripts, prayer and fasting is missing in Matthew, while prayer is in many of those same in MSS in Mark.
I believe there are two different sets of Greek manuscripts that are used today. One set of Greek manuscripts was used for the KJV and the other set of Greek manuscripts was used for the Modern Translations. Why do I believe this? Is this based just on History alone (Like what you are doing)? No. It is also based on the Word of God. For the Bible repeatedly teaches that there has always been a good choice and a bad choice. In the Garden, for Adam and Eve: there was a good tree and a bad tree. The Bible mentions that there is a vine of Sodom and there is also a true vine (Jesus Christ). There is a roaring lion seeking whom he may devour and then there is the Lion of the Tribe of Judah.
This makes why anyone would want to remove fasting, especially given how much the church generally exalted fasting from the fourth century, particular strange. I'm willing to concede that this is probably one of the most marginal cases, but the thing that tips it in my favour are 1) the abscence of any good reason why someone would want to remove JUST the fasting component and 2) the similar addition of prayer and fasting in a non-demon-related context in 1 Corinthians 7:5 in TR manuscripts but its absent in a large number and variety of earlier Greek manuscripts further suggests that were prepared to add those words in, for whatever reason.
1 Corinthians 7:5 does not suggest that we are to pray and fast for challenging situations. It just says that the husband and wife are to pray and fast and then come together (intimately) so that Satan does not tempt them (Which is no doubt because of the weakness of their flesh).
1 Peter 4:1 has precisely nothing to do with Matthew 7 or Mark 9. It is talking about Jesus, who suffered in the flesh and did away or finished with sin, and how we should mirror our attitude on his. You're clutching at straws here, mate.
We are told to resist the devil and he will flee from you. Resist him how? By not giving into temptation or sin. People would not be possessed by demons if their was no sin in their lives. To cease from sin, one needs to suffer in the flesh. This is what fasting is about. You are making the flesh suffer. It is a picture (as you said) of mirroring the suffering that Christ went thru so as to conform to His image. So when we mirror Christ (Who is Light) we repel that which is evil (dark). That's why the removal of the words that talk about fasting from fighting stronger dark forces is so wrong.
I'm a Trinitarian. I read the Bible without the comma. What does that tell you? That you don't need the addition of the comma in 1 John 5:7 to establish Trinitarian doctrine.
If this was the case, then you be placing your faith in church doctrine and not in what the Bible actually says. The guy who is marooned on an island with an island would have no straight forward explanation in God's Word as to why God is triune. He would only be making inferrences from other verses. 1 John 5:7 is the only verse that teaches the Trinity. In other words, God is not the author of confusion. The Lord is not going to have you guess about the Trinity and make only guesses.
It's striking that no church father explicitly refers to or quotes this verse in defence of Trinitarian doctrine during any of the heresies - it surely would have been the first port of call against Arius, for example, surely? Happy to give a fuller argument on why I think the Comma was an addition, but I think someone else might have already posted something somewhere.
Your limited sphere of Historical knowledge is not the sum of History, my friend. There are other Historical documents that suggest otherwise.
Is it true that 1 John 5:7 is not in any Greek manuscript before the 1600s? If it is true, why is it in the King James Bible?
I hardly think 1 Timothy 6:5, even without that clause, is advocating fellowship with such people. Most of 1 Timothy is advocating being wary of people who are out for financial gain, or are false teachers, etc etc.
No. It is says to be separate from those who think Godliness is gain. That's what the verse teaches. The removal of this verse makes one think it is okay to have fellowship with prosperity preachers (even if you may not do so). We are not to have fellowship with them because they are false believers.
But textually, again, the clause is missing from a large number of early manuscripts, with no particularly good reason for its removal given the rest of the chapter paints the same behavior incredibly negatively.
Again, you were not there to see which manuscripts you are looking at are true or false. In other words, I believe you are looking at false Greek Manuscripts. I base this belief not only on History, but on the Word of God and by doing a study on words here in the present moment (i.e. that things are changed for the worse and not for the better when one compares the KJV next to Modern Translations).
Ah, well, here's where we have bigger issues. This portion of Revelation is not concerned with the Millenium. It's clearly placed in the final eternal state, where God dwells with man, with a new heaven and earth. Only those whom belong to the lamb are counted among the people allowed to enter, which obviously includes "the nations". "Those who are being saved" may well be an accurate clarification, but it is not needed, and it is almost certainly not original. It is clearly not teaching all Gentiles will enter in, just from the rest of the passage.
So do you believe unsaved peoples will enter the Millennium?
It is an addition. Paul mentions the same point in v.4, defining those who are in Christ as those who walk in the Spirit. Again, if someone were trying to take out the phrase for some conspiratorial purpose, they did a terrible job because they left the same thing in 3 verses later.
No. There is no mention of the "Condemnation" which is defined for us in John 3:19-21 in verse 4. Taking away "walk after the Spirit" tied to the "Condemnation" ties in a point with another portion of Scripture. You take that out and you neuter the harmony of God's Word. Somebody could think verse 4 was just talking about physical death. But if we were to tie in Romans 8:1 (the complete passage) with John 3:19-21, it then becomes unmistakeable that this is talking about spiritual death.
Also, the version in the KJV is not even the only variant reading at this point. Another earlier variant reads "“who do not walk according to the flesh”". The fact that there are multiple variants, all of them derived from later in the same passage, and with attestation to the shortest reading in various Western and Alexandrian texts, makes it most likely an addition.
Again, you really have no way of really knowing what manuscripts are true or not true unless you can back up your belief that God's Word can be lost or corrupted or something.
Even then, it's an addition that doesn't change a singhe thing when read in the full context of Paul's argument in ch. 7-9.
Walk after the Spirit is not addition to Romans 8:1. It is meant to be in your Bible! You take those words away and the true believer cannot quote to an OSAS proponent that they must WALK after the Spirit so as not to be under the Condemnation in John 3:19-21.