Fundamentals of Islamic doctrine
It is well known from the sound evidence in the Book and the Sunnah that sayings and deeds are not accepted unless originate from a true doctrine. So if the doctrine is not sound then all what originates will be nullified for Allah (SWT) said, -meaning- { If anyone rejects faith, fruitless is his work, and in the Hereafter, he will be in the ranks of those who have lost (all spiritual good )}.
First, the Belief in Allah:
The belief in Allah necessitates the belief that He is the only worthy god being worshipped for being the only Creator, Cherisher, and Provider of the creation. It is He Who can reward their pious and punish their rebellious. In fact, it is this purpose for which He created the Worlds, He said, -meaning- { I have only created Jinn and men, that they may serve Me. No Sustenance do I require of them, nor do I require that they should feed Me. For Allah is He Who gives (all) Sustenance, -Lord of Power- steadfast (forever).}
Second, the belief in Angels:
This includes the belief in them specifically and as a whole. So Muslim has to believe that there exists Angels whom Allah created and molded them to obey. They are of many types, some of them are assigned to hold the Throne ( of Allah ) , others are treasurers for Paradise and Hell, others are assigned to record people’s deeds. And we believe in those whom Allah named such as Jibril ( Gabriel ) Mika’el ( Michael ), Malek the treasurer of Hell, and Israfil the one who will blow the Sur ( Trumpet ). ‘Aisha narrated that the Prophet (saw) said, meaning- “ Angels have been created ( by Allah ) from light, and Jinn have been created ( by Allah ) from fire without smoke, and Adam has been created ( Allah ) from what was described for you ( dust )”.
Third, the belief in Books:
It should be generally believed that Allah has descended Noble Books unto His Prophets and Messengers to clarify His Right on people and invoke it. We believe specifically in those which Allah named like the Tawrat ( Torah ), the Injil ( Gospel ), the Zabur ( Psalms ), and the Qur’an. In fact, Qur’an is the Last and the Best of them, and it is the Book which overwhelmed and confirmed what had preceded. Moreover, it is the Book to which the entire nation has to resort in judgement in addition to the sound Sunnah reported, Allah 9swt) said, -meaning- {To you We sent the Scripture in truth, confirming the Scripture that came before it, and guarding it in safety}.
Fourth, the belief in the Messengers:
A Muslim has to believe in Messengers specifically and as a whole. So we believe that Allah has sent to His servants warning and bearing good tidings Messengers invoking what is Truth. Consequently, he who followed their Message has won happiness, and he who left them out shall feel regret and be disappointed.
Their last and best one is our Prophet Muhammad ( SAW) Allah said, -meaning- {For We assuredly sent amongst every people a messenger, ( with the Command), “ Serve Allah and eschew Evil}. And He said, -meaning- { Mohammad (saw) is not the father of any of your men, but (he is ) the Messenger of Allah, and the Seal of the Prophets }. And we believe in whom Allah named like Nuh ( Noah ), Hud, Saleh, Ibrahim (Abraham), Musa (Moses), Isa (Jesus), and others may Allah bless them all.
Fifth, the belief in the Last Day ( Day of Resurrection):
This includes the belief in what Allah has revealed and what His Messenger has informed about. These are things that shall happen after death like the grave trial and torture and ease, the Sirat (Path over Hell), Mizan ( Balance of deeds), Account, Reward, and distributing books of deeds. This includes the aimed basin of the Prophet Muhammad (SAW), seeing and speaking with Allah which are gifted only to believers.
Sixth, the belief in Allah’s Decree and Predestination.
It is the strict dogma that Allah has created and owned everything, and that He has preordained the destiny of everything: guidance and going astray, and that everything is under His Control.
As for the belief in Allah’s Preordainment, it is done according to Allah’s Knowledge which has preceded and what His Wisdom necessitates.
It includes the following: Knowledge, Writing down, Will, Creating.