It's impossible! The texts we have today are collated from thousands of different manuscripts, each of which contains some portion of the Bible. These manuscripts are all copies of copies - the original writings of Moses, Isaiah, Paul, etc., have long since been lost. However, there are so many manuscripts, and from so many different geographical locations, that experts are able to check and double-check different "readings". Thus, we can be sure of the trustworthiness of what we read in our translations today. There will be minor differences between translations, but none which contradict any of the fundamental doctrines of the Bible.
Today, opinion is divided between two different schools: those who prefer the so-called "eclectic method" popularised by Wescott and Hort, followed by Nestle in his Greek Text, and a minority (myself included :-) who prefer the Textus Receptus, on which the King James and other versions are based.
I repeat, though: the differences between these texts are small, and while they are important for detailed study of the Bible, they do not affect the doctrines of Scripture.
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