Happy Easter!

[WinterHold]

So if a child says God is three, he is a disbeliever?

The verse itself is generalizing the people of the book of that time and place, and suratal Bayana shows they would not be separated until their came to them the clear proof which was the Messenger reciting them the signs of God.... 

Why does the verse say "the disbelievers from them", it's to show it's generalizing that most of those who say God is three or Jesus is God in that region, now have been reminded and know better, because as Suratal Bayana clarifies:

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لَمْ يَكُنِ الَّذِينَ كَفَرُوا مِنْ أَهْلِ الْكِتَابِ وَالْمُشْرِكِينَ مُنْفَكِّينَ حَتَّىٰ تَأْتِيَهُمُ الْبَيِّنَةُ {1}
[Shakir 98:1] Those who disbelieved from among the followers of the Book and the polytheists could not have separated (from the faithful) until there had come to them the clear evidence:
رَسُولٌ مِنَ اللَّهِ يَتْلُو صُحُفًا مُطَهَّرَةً {2}
[Shakir 98:2] A messenger from Allah, reciting pure pages,
فِيهَا كُتُبٌ قَيِّمَةٌ {3}
[Shakir 98:3] Wherein are all the right ordinances.
وَمَا تَفَرَّقَ الَّذِينَ أُوتُوا الْكِتَابَ إِلَّا مِنْ بَعْدِ مَا جَاءَتْهُمُ الْبَيِّنَةُ {4}
[Shakir 98:4] And those who were given the Book did not become divided except after clear evidence had come to them.
وَمَا أُمِرُوا إِلَّا لِيَعْبُدُوا اللَّهَ مُخْلِصِينَ لَهُ الدِّينَ حُنَفَاءَ وَيُقِيمُوا الصَّلَاةَ وَيُؤْتُوا الزَّكَاةَ ۚ وَذَٰلِكَ دِينُ الْقَيِّمَةِ {5}
[Shakir 98:5] And they were not enjoined anything except that they should serve Allah, being sincere to Him in obedience, upright, and keep up prayer and pay the poor-rate, and that is the right religion.
إِنَّ الَّذِينَ كَفَرُوا مِنْ أَهْلِ الْكِتَابِ وَالْمُشْرِكِينَ فِي نَارِ جَهَنَّمَ خَالِدِينَ فِيهَا ۚ أُولَٰئِكَ هُمْ شَرُّ الْبَرِيَّةِ {6}
[Shakir 98:6] Surely those who disbelieve from among the followers of the Book and the polytheists shall be in the fire of hell, abiding therein; they are the worst of men.
إِنَّ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ أُولَٰئِكَ هُمْ خَيْرُ الْبَرِيَّةِ {7}
[Shakir 98:7] (As for) those who believe and do good, surely they are the -best of men.
جَزَاؤُهُمْ عِنْدَ رَبِّهِمْ جَنَّاتُ عَدْنٍ تَجْرِي مِنْ تَحْتِهَا الْأَنْهَارُ خَالِدِينَ فِيهَا أَبَدًا ۖ رَضِيَ اللَّهُ عَنْهُمْ وَرَضُوا عَنْهُ ۚ ذَٰلِكَ لِمَنْ خَشِيَ رَبَّهُ {8}
[Shakir 98:8] Their reward with their Lord is gardens of perpetuity beneath which rivers flow, abiding therein for ever; Allah is well pleased with them and they are well pleased with Him; that is for him who fears his Lord.

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The division is when a clear proof comes and they cannot be divided from the believers without clear proof.

And the clear proof is not a book, but a Messenger who teaches the book, and so at this time, when the final leader of humanity, the proof of God is hidden, and the book is taught stupidly and dumbly by the supposed believers of the book..... excuse me for not judging people to disbelieve in the clear proof (which is hidden).

And to acknowledge that it is hidden, read Suratal Raad, which talks about the sign with respect to Mohammad being one who can only warn while there is a Guide for every people and another verse saying "the hiding (of the sign) is for God, so wait, we too are waiting"  meaning, most of the world even during Mohammad time didn't have the clear proof.

Until the clear proof is manifest to the whole world, I will not judge people to be disbelievers, neither Christians neither Atheists neither Hindus....

Lastly, the Quran predicts all Jews and Christians will believe in Jesus before his death, so don't give this crap that they are not people of the book any longer.

In this world; there are two types of speech:
1-Bullshit
2-Straight to the point
Bullshit usually takes a long time to explain; while straight to the point is straight to the point!
Let me give you an example. Hustlers use bullshit to distract you from a certain point, which is your bag or wallet, then rob the shit out of you. 
So don't be a hustler; please.
-The point: In Islam, whoever says Jesus is God, is a disbeliever, according to this verse:

https://atheistforums.org/thread-48601-p...pid1541224

Sura 5, Page 110, The Quran:
(17) Surely, in disbelief are they who say that Allah is the messiah, son of Maryam (Mary) . Say (O Muhammad صلى الله عليه وسلم): "Who then has the least power against Allah, if He were to destroy the messiah, son of Maryam (Mary), his mother, and all those who are on the earth together?" And to Allah belongs the dominion of the heavens and the earth, and all that is between them. He creates what He wills. And Allah is Able to do all things. 

Answer to this verse.
Respect the mind of the readers.
Don't hustle. You suck at it.
See a psychologist.