1. The Muslim's Relationship with Allah Self and Others
Summary of the Religion
of Islam

2. Religion has been ordained for the happiness of mankind in this world, and in the Hereafter.
The word "Islam" carries the meaning of submission and surrender to the will of Allah. This means that Islam is the religion of all prophets.
Allah said, by the tongue of Noah, as stated in the Holy Qur'an:
"And I have been commanded to be among those who conform to Islam. " (Sura 10:72)
And by the tongue of Ibrahim:
" (And make of us both) O God, our Creator, two Muslims who conform their will to Your will and of our progeny a Muslim nation who conform their will to Your will. " (Sura 2: 128 )
And by Joseph:
"Disembody my soul, O God, impressed with the image of religious and spiritual virtues, and join me to those whose deeds had been imprinted with wisdom and piety. " (Sura 12:101)

3. Allah has said:
"Religion, as a system of faith and legislation, commanded by God is Islam. " (Sura 3:9)
Mohammed is not the father of anyone of your men (so that he be prohibited to carry into effect the edict of God), but he is the Apostle of God and he is the ultimate of the prophets, the last of the long line of Apostles and the seal of Apostleship and of Prophethood. " (Sura 33:40)
And he who adopts a system of faith and worship other than Islam, or submission to God's blessed will alone- simply bends on a system of faith and worship which does not have the standing upon the vantage ground of truth; such system of faith shall not be accepted from him and he shall be a great loser Hereafter. ” (Sura 3:85)

4. The Call of Islam is directed to all mankind, the same to those who believe in a religion as to those who do not believe in a religion. Allah says in the interpretation of the meaning:
"And say to the people of the Book (Torah and Gospel) and to the illiterates (Are you now satisfied with what you heard and have your doubts been satisfied?) (If you are, then conform to Islam). If they do, then they are on the path of rectitude, but should they turn a deaf ear and their hearts have no ears for the truth nonetheless, you are only responsible for relating the message and God keeps a watchful eye upon His creation and the way they conduct themselves in life and He knows the attributes inherent in each and all.” (Sura 3:20)

5. As for Previous religions they were all restricted
They were sent to particular people and limited to particular times.
Islam alone is the one religion, which bears the seal of universality , as Allah himself says:
“Praise be to God and blessed is He who has revealed to His servant, (the Apostle Mohammad), The Qur'an, which He sent down to serve as the canon which illuminates the intellect and imparts the soundness of judgment in the choice of means and ends, in the choice of what is normally good, honest and straight forward, the canon which conducts him- The Apostle- to act as a spectacle and warning to all (intellectual) created beings . "
(Sura 25:1)

6. Also Allah says:
“ Say to them (O Mohammad): O you people, you had better believe that I have been sent to you all with a Divine Message from God." (Sura 7:158)
"When in effect it - The Qur'an - is but a universal Message which people have yet to learn, and an admonition and a counsel of the greatest concern.” (Sura 68:52)
The Prophet (sa) has said:
“ In the past, prophets had been sent to their own particular people; but I have been sent to all mankind.”
"And after me, there shall be no more prophets”

7. The universality and eternity of Islam is one of its own characteristics, because it consists of all the elements of maturity and comprehensives, which can meet the needs of mankind.
It coincides with the refinement of the human intellect and the progress of the human race; and thus Allah has said:
“Today I have completed your Religion for you, and graced you with the divine influence which operates in men to regenerate and sanctify and to impart strength to endure trial and resist temptation, and made all grace abound in you. And I have chosen for you Islam, as the acceptable system of faith and worship, not only to guide you into all truth, but also to make you better men. " (Sura 5:3)

8. The religion of Islam is founded on two main principles: Al-‘Aqidah (Faith) and Shari‘ah (Law)
FAITH, "Al-‘Aqidah”: means confirming belief in the heart, in all that prophet Mohammad (PBUH), came with, from all that should be known about it, and is necessary to know.
LAW, “Shari‘ah”: is the way in which we conduct our lives, and this mostly means practical deeds we carry out.
As with faith, it is something unseen - it is abstract. So that whoever believes with ‘Aqidah, with the acknowledgement of Shari‘ah, and yet falls short of practicing it, is regarded as disobedient; he will not be saved from the punishment of Allah, unless Allah forgives him.

9. Islam finalizes all that came before it
Islam finalizes all that came before it. Therefore there is no reason for a Muslim to read the Bible nor any other book, Instead all one needs is the Quran:
"And We have sent down to you (O Mohammad), the Book -the Qur'an-confirming the scriptures which were revealed before it (Torah and Bible) and serving as the Book of reference which does answer any query on matters disputed among people of the Book (Jews and Christians), for it is the umpire of all preceding scriptures (Torah and Bible), and the decision that is based on its precepts shall have to be accepted as final” (Sura 5:48)