Introduction
The first pillar of Islam called the Tawheed (testimony to belief in Oneness of God), has requirements as regards to belief which must all be satisfied for it to be accepted as a true testimony. These requirements are known as the six articles of faith. They are all composed of things which we can neither physically see on this Earth nor can we produce them in front of us if we wanted to. They are part of 'blind faith'. Islam unlike other religions is open to all sorts of questions and in the Quran God Almighty tells us that we must study what is evident (around us) and question it and only by pondering upon the signs in creation and then pondering on the word of God can we truly come to faith. When a person studies Islam, they must do so properly and ask all the questions they need to ask to satisfy their heart before entering it (see verse below). If a person agrees with what Islam has to say regarding creation, people and other things then there are certain things that they must accept without question, since these things are part of the 'unseen' domain by humans. These things are known as the six articles of faith and are as follows:
 1. Belief in the One Creator of everything, Allah.
 2. Unseen Angels & Jinns created by God
 3. All Revelations sent by God (The Quran is available, however prior to the Quran were revelations which were corrupted or lost)
 4. All Messengers of God (Past people met these messengers but now they are long dead so we only hear about them)
 5. Day of Judgment -The day when justice will be done and evil shall be rewarded with evil and good rewarded with good
 6. Al-Qadar, Predestination -Times in our life which are set as trials for us, loss of wealth, calamities, death, birth, wealth, etc

In the Glorious Quran Allah (swt) says:
 

Al-Quran, Chapter 2 Al-Baqara, Verse 208-209

In the Name of Allah, The Benevolent, The Merciful

O ye who believe! Enter into Islam whole-heartedly; and follow not the footsteps of the Evil One; for he is to you an avowed enemy.
If ye backslide after the clear signs have come to you then know that Allah is Exalted in Power Wise.

Explanation of the Six Articles Of Faith

1) Belief in God

Muslims believe in one, unique, incomparable God, Who has no son nor partner, and that none has the right to be worshipped but Him alone. He is the true God, and every other deity is false. He has the most magnificent names and sublime perfect attributes. No one shares His divinity, nor His attributes. In the Quran, God describes Himself:
 

Al-Quran, Chapter 112 Al-Ikhlaas, Verse 1-4

In the Name of Allah, The Benevolent, The Merciful

Say, “He is God, the One. God, to Whom the creatures turn for their needs. He begets not, nor was He begotten, and there is none like Him.”

No one has the right to be invoked, supplicated, prayed to, or shown any act of worship, but God alone.

God alone is the Almighty, the Creator, the Sovereign, and the Sustainer of everything in the whole universe. He manages all affairs. He stands in need of none of His creatures, and all His creatures depend on Him for all that they need. He is the All-Hearing, the All-Seeing, and the All-Knowing. In a perfect manner, His knowledge encompasses all things, the open and the secret, and the public and the private. He knows what has happened, what will happen, and how it will happen. No affair occurs in the whole world except by His will. Whatever He wills is, and whatever He does not will is not and will never be. His will is above the will of all the creatures. He has power over all things, and He is able to do everything. He is the Most Gracious, the Most Merciful, and the Most Beneficent. In one of the sayings of the Prophet Muhammad , we are told that God is more merciful to His creatures than a mother to her child.1 God is far removed from injustice and tyranny. He is All-Wise in all of His actions and decrees. If someone wants something from God, he or she can ask God directly without asking anyone else to intercede with God for him or her.

God is not Jesus, and Jesus is not God. Even Jesus himself rejected this. God has said in the Quran:
 

Al-Quran, Chapter 5 Al-Maida, Verse 72

In the Name of Allah, The Benevolent, The Merciful

Indeed, they have disbelieved who have said, “God is the Messiah (Jesus), son of Mary.” The Messiah said, “Children of Israel, worship God, my Lord and your Lord. Whoever associates partners in worship with God, then God has forbidden Paradise for him, and his home is the Fire (Hell). For the wrongdoers, there will be no helpers.”

God is not a trinity. God has said in the Quran:
 

Al-Quran, Chapter 5 Al-Maida, Verse 73-75

In the Name of Allah, The Benevolent, The Merciful

Indeed, they disbelieve who say, “God is the third of three (in a trinity),” when there is no god but one God. If they desist not from what they say, truly, a painful punishment will befall the disbelievers among them. Would they not rather repent to God and ask His forgiveness? For God is Oft-Forgiving, Most Merciful. The Messiah (Jesus), son of Mary, was no more than a messenger...

Islam rejects that God rested on the seventh day of the creation, that He wrestled with one of His angels, that He is an envious plotter against mankind, or that He is incarnate in any human being. Islam also rejects the attribution of any human form to God. All of these are considered blasphemous. God is the Exalted. He is far removed from every imperfection. He never becomes weary. He does not become drowsy nor does he sleep.

The Arabic word Allah means God (the one and only true God who created the whole universe). This word Allah is a name for God, which is used by Arabic speakers, both Arab Muslims and Arab Christians. This word cannot be used to designate anything other than the one true God. The Arabic word Allah occurs in the Quran about 2700 times. In Aramaic, a language related closely to Arabic and the language that Jesus habitually spoke,4 God is also referred to as Allah.

2) Belief in the Angels
Muslims believe in the existence of the angels and that they are honored creatures. The angels worship God alone, obey Him, and act only by His command. Among the angels is Gabriel, who brought down the Quran to Muhammad .

3) Belief in God’s Revealed Books
Muslims believe that God revealed books to His messengers as proof for mankind and as guidance for them. Among these books is the Quran, which God revealed to the Prophet Muhammad . God has guaranteed the Quran’s protection from any corruption or distortion. God has said:
 

Al-Quran, Chapter 15 Al-Hijr, Verse 9

In the Name of Allah, The Benevolent, The Merciful

Indeed, We have sent down the Quran, and surely We will guard it from corruption.

4) Belief in the Prophets and Messengers of God
Muslims believe in the prophets and messengers of God, starting with Adam, including Noah, Abraham, Ishmael, Isaac, Jacob, Moses, and Jesus (peace be upon them). But God’s final message to man, a reconfirmation of the eternal message, was revealed to the Prophet Muhammad . Muslims believe that Muhammad is the last prophet sent by God, as God has said:
 

Al-Quran, Chapter 33 Al-Ahzab, Verse 40

In the Name of Allah, The Benevolent, The Merciful

Muhammad is not the father of any one of your men, but he is the Messenger of God and the last of the prophets...

Muslims believe that all the prophets and messengers were created human beings who had none of the divine qualities of God.

5) Belief in the Day of Judgment
Muslims believe in the Day of Judgment (the Day of Resurrection) when all people will be resurrected for God’s judgment according to their beliefs and deeds. This will be a day when justice will reign supreme and God will give each person what they worked for on this Earth. If people were busied working for good and doing good deeds, their reward shall be the best of goods: Paradise. But if people on this Earth had been busy doing evil things, causing fights, wars, etc, then God shall reward them with the best of evil: Hell.
As for those who did not believe in Islam after they had received the message of God and instead choose to spend their time pursuing trivial activities on this Earth rather than questioning their existence God shall turn away from them as they had turned away from God on this Earth, and not given due consideration to his words. As for those who for some reason were never able to receive the message of God on this Earth, God shall forgive them and not hold them accountable. Each man and woman on the day of judgment shall be judged individually and only held accountable for their own deeds. The day of judgment marks the end of human existence in the Universe and a new chapter shall unfold in their existence.

6) Belief in Al-Qadar
Muslims believe in Al-Qadar, which is Divine Predestination, but this belief in Divine Predestination does not mean that human beings do not have freewill. Rather, Muslims believe that God has given human beings freewill. This means that they can choose right or wrong and that they are responsible for their choices. We are presented in this life with choices, opportunities and paths, we many times don't even see them coming, these are predestined for us, all that is left to us is to make the right choices.

The belief in Divine Predestination includes belief in four things: 1) God knows everything. He knows what has happened and what will happen. 2) God has recorded all that has happened and all that will happen. 3) Whatever God wills to happen happens, and whatever He wills not to happen does not happen. 4) God is the Creator of everything.