Belief in Allah
In the Name of Allah, the Most Gracious, the Most Merciful.
 
1. Say (O Muhammad) "He is Allah, (the) One.
2. "Allah-us-Samad {Allah the Self-Sufficient Master, Whom 
    all creatures need, (He neither eats nor drinks)}.
3. "He begets not, nor was He begotten".
4. "And there is none co-equal or comparable unto Him."
 
Qur'an  112:1-4
The Prophet (Peace Be Upon Him) said: “Do you know what Allah’s Right upon His slaves? He said: To worship Him Alone and to join none in worship with Him.”
 
At the heart of Islam lies belief in God. The core of the Islamic creed is bearing witness to the phrase, La ilaaha illa Allah, ‘There is no true deity deserving worship but Allah.’ The testimony to this belief, called tawhid, is the axies around which all Islam revolves. Moreover, it is the first of the two testimonies by which a person becomes a Muslim. Striving after the realization of that oneness, or tawhid, is the core of Islamic life.
 
According to Islam, the correct way of finding God is through the preserved teachings of the prophets. Islam maintains that the prophets were sent by God Himself throughout the ages to guide human beings to Him. God says in the Holy Qur’an that the correct path to belief is to reflect upon His signs, which point to Him.
 
Allah, the Exalted, says: “... We have indeed made plain the signs for people who believe with certainty.”     Qur’an   2:118
 
Mention of God’s handiwork occurs often in the Qur’an as the locus of divine revelation. Anyone who sees the natural world in all its wonder with open eyes and an open heart will see the unmistakable signs of the Creator.
 
Allah, the Exalted, says: ”And on the earth are signs for those who have Faith with certainty. And also in your ownselves. Will you not then see ?”    Qu’an  51:20-21
 
Belief in God in Islam consists of four matters:
1. Belief in God’s existence.
2. God is the Supreme Lord.
3. God Alone is entitled to worship
4. God is known by His Most Beautiful Names and
    Attributes.
One of the greatest acts of worship is prayer, invoking the Divine Being for aid. Islam specifies that prayer should only be directed to God. He is deemed in total control of every man’s destiny and
able to grant his needs and remove distress.
 
Allah, the Exalted, says: ”And invoke not besides Allah any such that will neither profit you not harm you, but if (in case) you did so, you shall certainly be one of the Zalimun (polytheists and wrong-doers”
Qur’an   10:106
 
Allah, the Exalted, says: “ Blessed be He Who sent down the criterion (of right and wrong, i.e. this Qur’an) to His slave (Muhammad) that he may be a warner ‘Alamin’ (mankind and Jinn). He to Whom belongs the dominion of the heavens and the earth, and Who has begotten no son (children or offspring) and for Whom there is no partner in the dominion. He has created everything, and has measured it exactly according to its due measurements. Yet they have taken besides Him other alihah (gods) who created nothing but are themselves created, and possess no power (of causing) death, nor (of giving) life, nor of raising dead.”
Qur’an   25:1-3
 
Giving anyone else - angels, prophets, Jesus, Mary, idols or nature - portion of one’s worship, which is essentially due only to Allah, such as prayer, is called Shirk and is the most enormous of sins in Islam. Shirk is the only unforgivable sin if not repented from, and it denies the very purpose of creation.
 
Allah, the Exalted, says: "Verily! Allah forgives not (the sin of) setting up partners (in worship) with Him, but He forgives whom He wills sins other than that, and whoever sets up partners in worship with Allah, has indeed strayed far away."
Qur'an   4:116
 
Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said:
 
Allah descends every night to the lowest heaven when one-third of the first part of the night is over and says: I am the Lord; I am the Lord: who is there to supplicate Me so that I answer him? Who is there to beg of Me so that I grant him? Who is there to beg forgiveness from Me so that I forgive him? He continues like this till the day breaks.
Sahih Muslim