1- Fortune telling is haram because only Allah knows the future. Claiming to know the future is a false claim and it’s haram to make such a claim.
2- The culture or fortune telling weakens the faith of people, distracts them from God, and makes them forget that He is in charge of everything. It can lead to disbelief or polytheism.
3- Our hadiths have condemned those engage in fortune telling, whether through astrology, soothsaying or getting in touch with the jinn. The Qur’an is very clear that only Allah knows the knowledge of the unseen and those whom Allah has shared this knowledge with (such as angels or prophets). See sura al-Jinn verse 26.
4- There are two types of divine wills: the contingent and the permanent. The contingent means that, for example, Saleh is supposed to live 30 years. But Allah has decrees that if Saleh pays charity and does good to his kin, Allah will extend his life another 30. This is what is mean by a fluid future. Allah gives a chance in changing some of these outcomes through our deeds.