ANSWER: Some try to prove the doctrine of the Trinity by quoting I John 5:7-8 which states: "For there are three who bear witness in heaven: the Father, the Word, and the Holy Spirit; and these three are one. And there are three that bear witness on earth: the Spirit, the water, and the blood; and these three are one."
The above emphasized words were added by editors of the Latin Vulgate translation in the early fourth century. They do not appear in any of the older Greek manuscripts nor in any of the older English translations. They were added to the Latin vulgate in the heat of a controversy between Rome and God's people. Bible commentaries explain that these words were never written in the apostle John's manuscript, or any existing copies of it. Because Trinitarians had no scriptural argument to stand on, some of them INJECTED SPURIOUS SCRIPTURE. They had no other way to biblically support their views!
There is a definite reason Satan, the archdeceiver, wanted that spurious verse added in the Latin Vulgate. The "trinity" doctrine completely does away with the Gospel of Jesus Christ. It limits the number of members of the God Family to only three - with no possibility of expansion. Jesus' Gospel is the message He brought to mankind from God the Father - the Good News of the coming Kingdom or Family of God. That is the one thing, above all, that Satan wants to hide from the eyes of man.