Big Blunder of Islam- Heaven or Hell is already pre-decided

Based on the Quran, our destination is fixed. So, whether one goes to paradise or the Islamic hell fire, is already fixed from birth. So why bother following Islam? Just live a good life without Islam.

“As He brought you (into being) in the beginning, so shall you be brought into being (on the Day of Resurrection) [in two groups, one as a blessed one (believers), and the other as a wretched one (disbelievers)]…” (Hilali & Khan, Al-Quran 7:29)

Allah’s Messenger (ﷺ), the true and truly inspired said, “(The matter of the Creation of) a human being is put together in the womb of the mother in forty days, and then he becomes a clot of thick blood for a similar period, and then a piece of flesh for a similar period. Then Allah sends an angel who is ordered to write four things. He is ordered to write down his (i.e. the new creature’s) deeds, his livelihood, his (date of) death, and whether he will be blessed or wretched (in religion). Then the soul is breathed into him. So, a man amongst you may do (good deeds till there is only a cubit between him and Paradise and then what has been written for him decides his behavior and he starts doing (evil) deeds characteristic of the people of the (Hell) Fire. And similarly, a man amongst you may do (evil) deeds till there is only a cubit between him and the (Hell) Fire, and then what has been written for him decides his behavior, and he starts doing deeds characteristic of the people of Paradise.” (Sahih Bukhari 3208)