The main problem with the validity of the modern versions is that they are translated from what is called an eclectic. [pick and mix]The majority text of both the old and new testament, which was traditionally accepted by bible believing Christians [the reformed protestants] for centuries has been altered in these modern eclectics.Two manuscripts from Alexandria Egypt, vaticannus and sinaiticus, which show certain evidence of corruption by gnostic heretics, are mixed in with the majority text to form the modern ecclectic texts from which most modern versions are translated. For a detailed analysis of the evidence of gnostic corruption in the vaticannus and sinaiticus manuscripts go to this website:http://www.studytoanswer.net/bibleversions/gnostic.htmlIn the places where the traditionally accepted text disagrees with the corrupted vaticannus and sinaiticus, the words of the corrupted manuscripts are chosen and used. This causes that most of the modern versions, like rsv, nasb, niv to be different from the King James version in about 5% of important places that pertain to Christian doctrine.The ecclectic texts are a pick and mix invention of the people that produce it. They choose what words to throw out of the traditional text and what words to add from the Alexandrian text. The NIV for example as well as other versions is translated from what is called the nestle-aland eclectic; it is in its 27th edition for the niv. Those people that produce these eclectics are literally changing the Word of God according to their own choosing. This is something that the bible says you may not do and serious punishments will be on those that do it.Note this warning from the book of Revelation:Revelation 22:18 For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book: Revelation 22:19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book.Changes attacking the deity of Christ:KJV from the byzantine majority text1 Timothy 3:16 And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory. Nasb16By common confession, great is (AF)the mystery of godliness:He who was (AG)revealed in the flesh,Was (AH)vindicated in the Spirit,(AI)Seen by angels,(AJ)Proclaimed among the nations,(AK)Believed on in the world,(AL)Taken up in glory. The real Word of God, from the KJV says God was manifest in the flesh. The NASB has removed that.--a deceitful sly changeThey take out the fact that Jesus is God.From the KJV majority textRomans 14:10 But why dost thou judge thy brother? or why dost thou set at nought thy brother? for we shall all stand before the judgment seat of Christ. Romans 14:11 For it is written, [As] I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God.Romans 14:12 So then every one of us shall give account of himself to God. That shows that Christ is God.From the Nasb10But you, why do you judge your brother? Or you again, why do you (P)regard your brother with contempt? For (Q)we will all stand before the judgment seat of God. 11For it is written,"®AS I LIVE, SAYS THE LORD, (S)EVERY KNEE SHALL BOW TO ME,AND EVERY TONGUE SHALL GIVE PRAISE TO GOD." 12So then (T)each one of us will give an account of himself to God.The word Christ is removed so that there is no proof Christ is God in those scriptures.From the KJV majority textActs 20:28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood.The RSV hasActs 20:28Take heed to yourselves and to all the flock, in which the Holy Spirit has made you overseers, to care for the church of God which he obtained with the blood of his own son.KJV has God's church was purchased by God's blood; therefore Christ is God. RSV separates Christ from God so it has eliminated the deity of Christ from the verse and does not show that Jesus is God. other examples attacking deity of Christ you look it upJohn 9:35 kjv compared to John 9:35 nasbMatthew 9:18 kjv compared to Matt.9:18 nasb removes the worship of Jesus.Jesus accepted Worship because He is God. [Peter refused to accept worship from cornelius because Peter is not God.Matt. 20:20, Mark 5:6, Luke 24:52 does the same thing in the Nasb, removes the worship of Jesus and therefore the nasb changes attack the doctrine of the deity of Christ.from the KJVMicah 5:2 But thou, Bethlehem Ephratah, though thou be little among the thousands of Judah,yet out of thee shall he come forth unto me that is to be ruler in Israel; whose goings forth have been from of old, from everlasting. Micah 5:2 from rsv...ruler in Israel, whose origin is from old, from ancient days.God has no origin. Christ had no origin because He is God.Saying Christ had an origin, the rsv is denying the deity of Christ.Vese attacking salvation by faithfrom Kjv1 Peter 2:2 As newborn babes, desire the sincere milk of the word, that ye may grow thereby: from rsvLike new born babes, long for the pure spiritual milk, that by it you may grow up to salvation.the rsv has salvation by works, not faith.Salvation is a free gift of grace; by grace you are saved through faith; it is not of works like it says in ephesians. It is impossible to grow up to salvation, salvation is a free gift, you don't grow up to it, you don't work for it, you don't gradually obtain it. I could go on to add verse changes attacking the atonement, second coming of Christ, the Word of God, virgin birth.There are many of those changes that attack important Chritian doctrines in the modern versions. See Let's weigh the evidence, by Barry Burton.