Does 1 John 5:7-8 prove the Trinity?

COGwriter Some claim that 1 John 5:7-8 is proof of the Greco-Roman trinity (and that the above diagram ‘explains’ the trinity). This recently happened to me. But is 1 John 5:7-8 really even supposed to be in the Bible? The above drawing is also used by some trinitarians to explain the trinity, even though it [...]