The KJV is basically unchanged from 1611. Here is an interesting article on the changes that have been made in the KJV.
http://www.biblebelievers.com/Reagan_myth-early.html
The main reason the original KJV looks different is the different style type. The original was Gothic Type Style. The second thing people notice is the spelling of words. English was still coming into it's own at this time, and there was no standard spelling for some words. As time went by a standard was established and so the words were spelled differently, but they are the same exact words. The third type of change was Textual. The article I showed can explain these changes much better than I.
As for people not agreeing with me, that's OK. Many years ago I did a detailed study on how the different versions of the Bible came to be. I have probably forgotten everything I read at that time, but I became convinced that the KJV was the accurate word of God. It is also a matter of faith, I simply believe that Jesus is perfect and infallible, and that his word is perfect and infallible. The scriptures themselves say Jesus's name is "The Word of God"
Rev 19:13 And he was clothed with a vesture dipped in blood: and his name is called The Word of God.
That verse may not mean much to some people, but it means a great deal to me.
Matt 4:4 But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.
Years ago I noticed that Jesus said we are expected to live by "every word" that proceedeth out of the mouth of God. The word "every" really stuck with me, and I thought on it for days. Finally I realized if God expects us to live by every word, then a fair and just God would provide every word.
Another verse that led me to believe an infallible version exists is Revelations 22:18-19.
Rev 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:
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.
Here God gives some very serious warnings to anyone who adds or takes away from his word. But what occured to me is that no man could possibly know if words had been added or subtracted unless a perfect and infallible version existed that could be identified.
There are many other verses beside these, but these are some of the scriptures that convinced me an infallible version existed. I have come to believe the KJV is that version in English. And as I have argued earlier, history itself supports the KJV. It has been the dominant Bible for almost 400 years now, and has been the version primarily used to evangelize the world. I do not think that an accident.
I don't argue with folks about it though, few people change their opinion on this subject, I have debated it many times with many people.