Regarding Iblis being a Jinn or an Angel, the Quran states that humans are created from clay and jinn from smokeless fire; as for angels, the Quran does not specify if they are a separate creation and/or what they are made of. In Quran 35:1, the term جَاعِلِ is used to state that angels are made/appointed as messengers with wings. Moreover, in every narration of the story of Adam, it is related that the angels were ordered to prostrate/submit. Iblis could only disobey this command if he was also an angel. Hence, I believe that angel is a designation by appointment and not by creation.
In my blogpost on Satan's Enmity: Origin & Objective, I've discussed that Adam was superior to the angels by virtue of the knowledge taught to Adam by God.
The Quran uses the Arabic term for inheritance for the Gardens promised to the righteous Believers who do Good Deeds. Inheritance implies that we will not be guests but rather owners of those gardens. I think this means we shall have a much larger role and be entrusted with the land we inherit!
The inheritance will vary in accordance with the faith and actions of each individual, as indicated in the size of the gardens mentioned in 57:21 and 3:133, and as stated in 8:4. For those who believe and seek forgiveness for their sins, God will grace them with a garden as extensive as heaven [singular] and the earth, while those who also keep their duty to God, the pious, the reward will be greater: as extensive as the heavens [plural] and the earth. The believers will have exalted grades/grades of dignity, forgiveness and honourable sustenance.
The last two verses of Surah al-Ahzab inform us that The Human volunteered for The Trust. Since he has been unjust and ignorant, that is the reason why the hypocrites and the polytheists must be punished, while God turns in mercy and forgives the believers. The verse specifically mentions both men and women of all three categories.
The second and third verse of Surah Al-Insan inform us that we have been created to be tested, and provided with the faculties and the guidance we need. Its up to us whether we are grateful for it or if we reject it.
I hope the above helps unlock the mystery for you.
1. Man is made of twisted black clay.
2. Jinn is made of the flame of fire.
3. Angel is made of light with wings in pair(s).
4. All living things are based on water.
5. Only Man and Jinn has the power of choice.
When ALLAH taala commanded the Angels, Iblis took the benefit of doubt and remained stationed in the Heavens of ALLAH taala. After causing the mischief he got caught and argued with ALLAH taala to invoke HIS wrath upon himself. Mr. and Mrs. Adam repent and begged for HIS mercy so they were pardoned. All three of them were removed from the Heavens as enemies to write the test on earth. This answers the objection of MSA as well.
Both Mr. and Mrs. Adam were held responsible for their mistake and dealt together.
Rasool is a designation not a creation. 35:1 concludes the two together.
Now against your belief that Angels are not a creation but merely a designation, there are quite a few evidences in alQuraan. Here is one that supersedes them all:
Please let me know if this does not corrects your misbelief.
However, consider also Q 6:130
Reply: It is an article of faith to believe that angels exist. It is not an article of faith to assert/insist that they are or not a separate form of creation. Since I believe the the entire Quran is from Allah, and free from errors, I wonder what is meant by Q18:50
And Allah knows best!