Allah Subhanahu wa Ta’ala revealed to Prophet Muhammad Sallallahu `alayhi wa Sallam, a set of laws. Some of these laws are to be implemented in a Muslim’s personal life, others are collective laws that require a government and a community. Secularism is a kufriyyah ideology that restricts religion to a person’s private life. A secularist is opposed to those of Allah’s laws which pertain to a community’s collective life.
Sindh has been an Islamic land for more than a thousand years. Urdu speaking Muslims who settled here some sixty years ago (like my grandparents) had their right to settle here because they were Muhajireen in the way of Allah. Now those of their descendants who have renounced Islam and have become secularists have no basis to remain in Sindh and should be driven back to where they came from.