The Characteristics Every Muslim Must Have -
1) A Muslim does not commit any act of shirk.
Allah says (what means):
"Verily, Allah forgives not that partners should be set up with Him." (al- Nisa:48)
"Verily, whosoever sets up partners in worship with Allah, then Allah has forbidden Paradise for him, and the Fire will be his abode. And for the wrongdoers there are no helpers."(al-Maidah:72)
2) A Muslim does not set up an intermediary (middle person) between themselves and Allah.
"If you invoke them (the dead), they hear not your call, and if they were to hear they could not grant it to you. And on the Day of Resurrection, they will disown your worshipping them. And none can inform you like Him Who is the All-Knower."(Fatir:14)
3) A Muslim acknowledges that non-Muslims who reject Islam are disbelievers.
"And whosoever seeks a religion other than Islam, it will never be accepted of him, and in the Hereafter he will be one of the losers." (Al-Imran:85)
5) A Muslim does not dislike any part of the religion of Islam.
"But those who disbelieve, for them is destruction, and [Allah] will render their deeds vain. That is because they hate which Allah has sent down, so He has made their deeds fruitless." (Muhammad:8-9)
6) A Muslim does not make fun of any part of the religion.
"If you ask them, they declare, "We were only talking idly and joking." Say, "Was it Allah and His Verses, and His Messenger that you were mocking?" Make no excuse, you have disbelieved after you had believed." (al-Taubah: 65-66)
7) A Muslim does not perform any kind of sorcery.
"They followed what the devils gave out in the lifetime of Solomon. Solomon did not disbelieve, but the devils disbelieved, teaching men magic and such things that came down at Babylon to the two Angels, Harut and Marut, but neither of these two taught anyone till they had said, ‘We are only for trial, so disbelieve not’" (al-Baqarah: 102)
8) A Muslim does not support disbelievers or give one’s loyalty to them.
"O you who believe, take not the Jews and Christians as protectors and helpers, they are but protectors and helpers of one another. And if any among you take them as protectors and helpers, then surely he is one of them. Verily, Allah guides not those people who are wrongdoers." (al-Maida: 51)
9) Muslims believe all of mankind has to follow the shariah of Islam.
"Truly the religion with Allaah is Islam" (Al-Imran:19)
A Muslim does not turn away from the religion and learns and applies the essential aspects of Islam.
"And who does more wrong than he who is reminded of the verses of his Lord, then he turns away therefrom? Verily, We shall exact retribution from the sinners." (al-Sajda: 22)
A Muslim does not deny anything that is known by necessity to be part of Islam.
"Do you then believe in part of the Scripture and reject part of it? What is the recompense of those who do so among you except disgrace in the life of this world and on the Day of Resurrection they shall be consigned to the most grievous torment. And Allah is not unaware of what you do." (al-Baqara: 85)