The Holy Trinity

The only verse in the entire Bible that supports the Trinity is this:

1 John 5:7

For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.

There are no Greek manuscripts that mention this. These being the oldest manuscripts. One was produced in the 1500's, but this was very dubious in origin. It was a translated version, from Latin to Greek, that includes this verse. Many scholars will simply omit this verse entirely, as it is impossible to verify it's veracity.

The original text could have included this verse, then been lost when copied and all subsequent versions being based on the copy. It is also possible a theologically motivated scribe simply elaborated the passage to allude to the Trinity. Scribes would do this on a regular basis. In Hebrews 1:3 "Jesus reflects the glory of God, and upholds the universe by his word of power." A scribe was caught chaning the word "upholding" to "revealing." This was caught and a rebuke was placed in the margin telling the scribe to stop the behavior.

There are several examples of this heppening in the translations. Scribes would change text based upon their personal belief's, correcting an error, or making the text mesh with other texts of the day and other theological thought. Scribes were also just making mistakes in translation. The oldest manuscripts often show the most evidence of alteration.

The King James Version was based upon the first Greek only New Testament manuscript published. This was cobbled together from Grrek and Latin translations.