Ideology of Pakistan is the name of determination of Muslims according to which they take leading their political, social and economic life as their due right. This could also be said that to act in accordance with the ideology of Islam is nothing but to act according to ideology of Pakistan.
When a Muslim, as the reciter of Kalima, accepts Islam then he promises before his AllaH (GoD) and determines that he will lead every walk of his life according to Quran and Sunnah.
Ideology of Islam is nothing but to follow the teachings of Islam. Indo-Pak subcontinent was divided on the basis of the principles that the Indian Muslim were requiring a separate home land of their own where they could lead their lives according to Quran and Sunnah.