Dear brother Jawaid,
You were more clear in the previous post.
SHIRK becomes unforgiven if carried till death.
4:18 The forgiveness is not for those who commit transgressions until death comes to one of them, and then he says, “I repent now.” (They have no time to make amends.) Nor is the forgiveness for those who die as rejecters of truth. We have prepared an awful suffering for them.
2:132 This very legacy Abraham left to his children, and so did Jacob, saying, “O My children! Indeed, God has chosen for you the Way of Life. Therefore, let not death overtake you except that you are submitters (Muslim).”
[Deen = The Divinely Prescribed System of Life = Al-Islam. It has more to do with the collective life of humans and the science of sociology. It concerns itself with people living in this world collectively in peace according to a Code of permanent values that ensures success in both lives. Religion (Mazhab) is more of a generic term signifying a creed involving certain rites and rituals and seeking individual salvation. Islam being a Collective System of Life is, in fact, a challenge to religion]