Deen Kia Hay? is an Urdu Book by Ex. Justice Mufti Taqi Usmani,this book is about reality of meanings of Religion, Islam. It is our need as being a Muslim to know the religion and act as true Muslim. Adam and all his Children are created for the religion of Islam.In this world we have to face affairs of two kinds. To avoid evils and to follow way of Prophets of Allah and follow the verses of Holy Quran. And many more to know.