Sorry, what question in Revelation 4:2? That verse says:
(Rev 4:2) Immediately I was in the Spirit; and behold, a throne set in heaven, and One sat on the throne.
There is no question in that verse.
As for "passing the test given by the Lord Jesus in 1 John 4:2–3," I repeat, in those verses, John tells his Christian readers how to discern between false teachers and true. It was a test they were to apply to what they heard from the teachers, not a test question they were to ask the teachers.
Even taking your idea, that the test is (in your opinion) one that each Christian must pass or fail, I do fully believe that the Lord Jesus Christ is come in the flesh. Again, I will not answer for Dino246.
Although the whole Bible, including John's letters, is the word of God, it was John who, under the inspiration of the Holy Spirit, wrote the instructions to his Christian readers about those who claimed to teach God's truth:
(1Jn 4:1) Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world.
(1Jn 4:2) By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God,
(1Jn 4:3) and every spirit that does not confess that Jesus Christ has come in the flesh is not of God. And this is the spirit of the Antichrist, which you have heard was coming, and is now already in the world