Islamically neither Sunnis or Shias deserve to go to hell....

[Mystic]

This is from an Islamic perspective.

1) The Quran promises those whom believe in God and his Messengers paradise. Shia and Sunni both believe in God and his Messengers.

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[Shakir 57:19] And (as for) those who believe in Allah and His messengers, these it is that are the truthful and the faithful ones in the sight of their Lord: they shall have their reward and their light, and (as for) those who disbelieve and reject Our communications, these are the inmates of the hell.
[Pickthal 57:19] And those who believe in Allah and His messengers, they are the loyal, and the martyrs are with their Lord; they have their reward and their light; while as for those who disbelieve and deny Our revelations, they are owners of hell-fire.
[Yusufali 57:19] And those who believe in Allah and His messengers- they are the Sincere (lovers of Truth), and the witnesses (who testify), in the eyes of their Lord: They shall have their Reward and their Light. But those who reject Allah and deny Our Signs,- they are the Companions of Hell-Fire.
يَا أَيُّهَا الَّذِينَ آمَنُوا تُوبُوا إِلَى اللَّهِ تَوْبَةً نَصُوحًا عَسَىٰ رَبُّكُمْ أَنْ يُكَفِّرَ عَنْكُمْ سَيِّئَاتِكُمْ وَيُدْخِلَكُمْ جَنَّاتٍ تَجْرِي مِنْ تَحْتِهَا الْأَنْهَارُ يَوْمَ لَا يُخْزِي اللَّهُ النَّبِيَّ وَالَّذِينَ آمَنُوا مَعَهُ ۖ نُورُهُمْ يَسْعَىٰ بَيْنَ أَيْدِيهِمْ وَبِأَيْمَانِهِمْ يَقُولُونَ رَبَّنَا أَتْمِمْ لَنَا نُورَنَا وَاغْفِرْ لَنَا ۖ إِنَّكَ عَلَىٰ كُلِّ شَيْءٍ قَدِيرٌ {8}
[Shakir 66:8] O you who believe! turn to Allah a sincere turning; maybe your Lord will remove from you your evil and cause you to enter gardens beneath which rivers flow, on the day on which Allah will not abase the Prophet and those who believe with him; their light shall run on before them and on their right hands; they shall say: Our Lord! make perfect for us our light, and grant us protection, surely Thou hast power over all things.
[Pickthal 66:8] O ye who believe! Turn unto Allah in sincere repentance! It may be that your Lord will remit from you your evil deeds and bring you into Gardens underneath which rivers flow, on the day when Allah will not abase the Prophet and those who believe with him. Their light will run before them and on their right hands; they will say: Our Lord! Perfect our light for us, and forgive us! Lo! Thou art Able to do all things.
[Yusufali 66:8] O ye who believe! Turn to Allah with sincere repentance: In the hope that your Lord will remove from you your ills and admit you to Gardens beneath which Rivers flow,- the Day that Allah will not permit to be humiliated the Prophet and those who believe with him. Their Light will run forward before them and by their right hands, while they say, “Our Lord! Perfect our Light for us, and grant us Forgiveness: for Thou hast power over all things.

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2) They both are sincerely striving to follow the path of God and as far as the code goes, it's nearly the same...


So why do Sunnis and Shias teach the all sects are bound to hell except their own?

1) Hadiths + want of scholars to follow hadiths over Quran where it suits their sectarian bias.
2) Lack of tolerance for creed differences in Islamic culture.

[Haydn2]

So why do Sunnis and Shias teach the all sects are bound to hell except their own?

For control and power . Also the origin of the core religion.

[Mystic]

So why do Sunnis and Shias teach the all sects are bound to hell except their own?

For control and power . Also the origin of the core religion.

True said...

1) Hadiths + want of scholars to follow hadiths over Quran where it suits their sectarian bias.
2) Lack of tolerance for creed differences in Islamic culture.
3) For control and power.

Control and power can also be seen as the motivation of 1 and 2.

I would say however this is not a decision they realize. They want to control the masses and have power over them, so as to "guide them"...although inwardly they probably love the position of power and authority and it's high motive as well.

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I would say it's even more complicated then this.

1) Scholars go their to learn the religion.
2) They already trust the scholars they learn from.
3) The system of knowledge (Imel Rijaal + hadiths) is taken as a proper way to know religion.
4) Contradictions of hadiths with Quran are not realized because of confirmation bias....the same reason why Quran verses and logical problems with them and contradictions aren't realized.
5) They are vested with authority to guide according to the knowledge they have and trusted by the community for knowledge, just as they trusted the scholars themselves.

But in the past...the reason why these hadiths were chosen...was due to intolerance of differences and sectarian bias which was motivated by want to control and manipulate by hadith narrators and hadith collectors and those whom authenticate narrators.