Apparently, they (Shai) do not believe in Qur'an....
(Qur'an 36:12) إِنَّا نَحْنُ نُحْيِي الْمَوْتَىٰ وَنَكْتُبُ مَا قَدَّمُوا وَآثَارَهُمْ ۚ وَكُلَّ شَيْءٍ أَحْصَيْنَاهُ فِي إِمَامٍ مُّبِينٍ
Verily We shall give life to the dead, and We record that which they send before and that which they leave behind, and of all things have We taken account in a clear Book (of evidence).
بے شک ہم ہی مردوں کو زندہ کریں گے اور جو انھوں نے آگے بھیجا اور جو پیچھے چھوڑا اس کو لکھتے ہیں اور ہم نے ہر چیز کو کتاب واضح (لوح محفوظ) میں محفوظ کر رکھا ہے
In the context of the above aayah and the preceding Aayahs of the Holy Qur'an, it is evident that these words "imaam in mubeen" mean an clear Book (لوح محفوظ). But they would interpret it differently just to justify their false belives.
(Qur'an 33:33) وَقَرْنَ فِي بُيُوتِكُنَّ وَلَا تَبَرَّجْنَ تَبَرُّجَ الْجَاهِلِيَّةِ الْأُولَىٰ ۖ وَأَقِمْنَ الصَّلَاةَ وَآتِينَ الزَّكَاةَ وَأَطِعْنَ اللَّهَ وَرَسُولَهُ ۚ إِنَّمَا يُرِيدُ اللَّهُ لِيُذْهِبَ عَنكُمُ الرِّجْسَ أَهْلَ الْبَيْتِ وَيُطَهِّرَكُمْ تَطْهِيرًا
And stay quietly in your houses, and make not a dazzling display, like that of the former Times of Ignorance; and establish regular Prayer, and give regular Charity; and obey Allah and His Messenger. And Allah only wishes to remove all abomination from you, ye members of the Family, and to make you pure and spotless.
اور اپنے گھروں میں بیٹھی رہو اور گزشتہ زمانہ جاہلیت کی طرح بناؤ سنگھار دکھاتی نہ پھرو اور نماز پڑھو اور زکواة دو اور الله اور اس کے رسول کی فرمانبرداری کرو الله یہی چاہتا ہے کہ اے اس گھر والو تم سے ناپاکی دور کرے اور تمہیں خوب پاک کرے
The context in which this verse occurs makes it manifest that the word ahl al-bait (people of the house) here implies the wives of the Holy Prophet ﷺ, because the address begins with: "O wives of the Prophet," and they are the addressees in the whole discourse preceding it as well as following it. But Shia will twist its interpretation and say that it proves that Ahle-Bait are infallible (غلطیوں سے پاک).
Should we stop quoting verses of Qur'an as well?