I rember reading the story of a missionary who shared with an unbelieving Muslim the verses from 1 John 4:2-3. Mockingly, the Muslim began to say, "Jesus Christ has come in the flesh is from God" several times; then he said, "See there, I told you I could say it, even though I believe otherwise."
The missionary thought about it for a moment, then called a few of his Muslim friends over, and said to them, "I want you to listen to what your Muslim brother has to say to you about Jesus." The Muslim fled away from the missionary and the other Muslims in terror.
It's not whether or not anyone can simply say "Jesus Christ has come in the flesh is from God."
1John 4:2
Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: 3 And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that [spirit] of antichrist, whereof ye have heard that it should come; and even now already is it in the world. The test as described by my ministry partners is to ask the spirit to confess something like "Are you of the Holy Spirit of Jesus Christ?" If the spirit answers in the affirmative then the next request is:
"Confess that Jesus Christ is come in the flesh".
Jesus IS, was, and will be. The Alpha and Omega.
An unclean spirit will sometimes obfuscate by responding with something like "I am he." Then another query like "Are you of the Holy Spirit that was sent in Jesus name, who was crucified, died, and was buried, and was resurrected on the third day, ascended into heaven, and is seated at the right hand of God the Father?"
It went just like that for a pastor who had a woman in her church speaking in tongues, that she was uncomfortable with. On the instruction of one of my ministry partners she performed the preceding, where after a guttural "Nooooooooo" was uttered by the unclean spirit in the woman, as the woman flipped out of her chair and writhed on the floor.
The bible warns us about "familiar spirits" as this woman voluntarily harbored and nurtured.
In around 95 AD, John warned about a church already under satanic attack, in the 2 and 3 chapters of Revelation. There likely isn't much of that difficulty within the mosque, since satan already has those poor folks in his back pocket.
You seem to be ignoring the term "spirit" (pneuma) in the context of the verse. It's about trying spirits.
Pretty difficult to suggest something like "person" can be substituted for "spirit" in that verse:
spirit
New Testament Greek Definition:
4151 pneuma {pnyoo'-mah}
from 4154; TDNT - 6:332,876; n n
AV - Spirit 111, Holy Ghost 89, Spirit (of God) 13,
Spirit (of the Lord) 5, (My) Spirit 3, Spirit (of truth) 3,
Spirit (of Christ) 2, human (spirit) 49, (evil) spirit 47,
spirit (general) 26, spirit 8, (Jesus' own) spirit 6,
(Jesus' own) ghost 2, misc 21; 385
1) the third person of the triune God, the Holy Spirit, coequal,
coeternal with the Father and the Son
1a) sometimes referred to in a way which emphasises his
personality and character (the \\Holy\\ Spirit)
1b) sometimes referred to in a way which emphasises his work
and power (the Spirit of \\Truth\\)
1c) never referred to as a depersonalised force
2) the spirit, i.e. the vital principal by which the body is animated
2a) the rational spirit, the power by which the human being feels,
thinks, decides
2b) the soul
3) a spirit, i.e. a simple essence, devoid of all or at least
all grosser matter, and possessed of the power of knowing,
desiring, deciding, and acting
3a) a life giving spirit
3b) a human soul that has left the body
3c) a spirit higher than man but lower than God, i.e. an angel
3c1) used of demons, or evil spirits, who were conceived
as inhabiting the bodies of men
3c2) the spiritual nature of Christ, higher than the highest
angels and equal to God, the divine nature of Christ
4) the disposition or influence which fills and governs the soul
of any one
4a) the efficient source of any power, affection, emotion, desire, etc.
5) a movement of air (a gentle blast)
5a) of the wind, hence the wind itself
5b) breath of nostrils or mouth
It's whether or not someone can say "Jesus Christ has come in the flesh is from God" and really mean it when it really costs you something, like your very life.
Do you really think a reprobate atheist would have any trouble repeating that?
Like Pat Condell for example:
http://www.youtube.com/watch?v=V8PCecgWKeIOr any of these folks:
http://www.youtube.com/profile?user=BlasphemyChallenge&view=favoritesA satanist could repeat it in all honesty.