The term Islam is derived from the root Silm which signifies
peace - peace with Allah as well as with all the creatures.
Technically speaking, Islam means "full submission to the Will of Almighty God in all walks of Life". Every Muslim must confess and affirm the fact that there is none worthy of worship and obedience except Allah, and that Muhammad (peace be upon him) is his slave and Messenger.
Along with the confession of this basic kalimah, a Muslim has to declare his faith in the angles, in all the prophets, in the revealed scriptures, in the day of judgement, and in taqdir (predestination). In the following pages, some details have been provided for the common readers, Muslims as well as non-Muslims, about the basic principles of Islamic faith.
In addition, a Muslim must believe in all the revealed
scriptures. The earlier revealed books were tempted by their
adherents or destroyed by their enemies. The exact number of
the revealed scriptures is not known to us. The Qur'an has
mentioned the Torah along with some other ,
Small Books (revealed to Moses),
Psalms (revealed to David),
Injil (Bible revealed to Jesus),
Small Books (revealed to Ibraham),
and The Qur'an itself (revealed to Muhammad, peace be upon all of them).
The Qur'an (revealed to Muhammad, PBUH) is the last, final, and comprehensive guidance of Allah for all the people of all times to come. No other revelation is to come down after the Qur'an from Allah's side for the guidance of the people. It confirms the prophethood of all the true prophets of Allah and demands full faith in them from all the believers. It also confirms the scriptures that came before it. The Qur'an contains all the basic principles of all the revealed scriptures and safeguards them.