I bet you will say something idiotic like... "Oh that verse should not be in the bible, it was put in by the Catholics..." Says who? It's God's word... stop listening to man.
Why would it be 'idiotic' to point out the simple fact that this verse, 'the Johannine Comma', is missing from the oldest and most reliable manuscripts?
Are you familiar with the ad hominem fallacy?
It's very telling that when somebody points out that the bible contains no clear statement of the Trinity you are forced to resort to a verse that is rejected by the vast majority of scholars. If the doctrine of the trinity is important why did Jesus not state it unequivocally and why did God not preserve this statement?
Please note that I am NOT saying that the bible does not contain many verses that support a view of Jesus as God. The problem is that is also contains many other verse that do the opposite.
You start from one position and then cherry-pick your 'evidence'. The Watchtower does the same from the other side. Both of you are ignoring the inconvenient fact that the bible does not present a coherent Christology.