Dear Usman :
I am sorry but either you've intentionally or unintentionally stated the wrong concept here. Its the other way round. Mazhab is one part of Deen
Mazhab
Mazhab is limited to and deals with the faith and rituals of an individual. It binds together the 'Devotee' (Worshipper) to his 'Devotion'(Allah / God).
ii) The frame of reference of Mazhab is limited to Huquq-ul-Allah
iii) The canvas of Mazhab is very narrow and limited to an individual
Deen
Deen is divine and dynamic combination of (a)Institution (b) practices (c) Believes (d) Social Order
OR in broader context Deen includes (a) Mazhab (b)Social Life (c) Relation with minority (d) Justice
ii) The frame of reference of Deen includes both (a) Huquq-ul-Allah (b) Huquq-ul-Ibad
iii)The canvas of Deen is broad.
iv)In Surah Kafiron the word Deen is used necessarily for 'Ibadaat'
v)In Surah Aale Imran the word Deen is used to mention Religion of Allah , mafhoom is (Religion (Deen) in the sight of Allah is Islam)
vi)In Surah Fatiha , it is used for the' Day of Judgment' and the Day of Judgment will be to carry out Justice for a small sin equivalent to the grain in size or a sin equivalent to mountains. So indirectly, we can say its used for 'Justice'
vii) In surah Al-Anfal verse 39 , the word Deen is used and its said that 'and fight them(Infidels) until there is no Fitna(mischief) and religion is all for Allah.
The word Deen is used in the above ayats and not Mazhab. So its Deen that is whole and not Mazhab. Mazhab is only one part of Deen.