Has Allah fixed who will enter paradise and hell?
Let us read next few Ayah from Surah Al-A'raf:
180 - And Allah's are the best names, therefore call on Him thereby, and leave alone those who violate the sanctity of His names; they shall be recompensed for what they did.
181 - And of those whom We have created are a people who guide with the truth and thereby they do justice.
182 - And (as to) those who reject Our communications, We draw them near (to destruction) by degrees from whence they know not.
Where does the ayah says that Allah has already decided who will enter paradise and hell?
The ayah quoted i.e 7:179 is saying that Jinn and mankind will enter hell fire. And immediately Allah answers the reason. What is concluded from the ayah directly contradicts with the ayah itself.
Ayah gives the "reason" why people will enter hell. reason is:
1. They do not use their faculties for understanding / pondering.
2. Their approach is that of blind faith [Which is the case with most of muslims and non muslims]
3. Due to their own action these people will enter Hell.
Allah has said in this ayah that hell is meant for jinn and human being and one of the reasons is that they do not use their aql / common sense / faculties.
In fact, next 3 ayah also carries same view that it is the action of an individual that will take him / her to paradise-hell. It is not Allah who has "fixed" actions of human being. Kindly read next three ayah:
7:180 - "...they shall be recompensed for what they did"
7:181 - "And of those whom We have created are a people who guide with the truth and thereby they do justice"
7182 - "And (as to) those who reject Our communications, We draw them near (to destruction) by degrees from whence they know not."
Nowhere Quran says that its Allah who has already "fixed" who will enter paradise-hell. What Allah has prefixed is his "LAWS" that will lead to path of guidance or mis-guidance.