There is a clear definition of God: Say, “He is Allah, [who is] One,Allah, the Eternal Refuge. He neither begets nor is born. Nor is there to Him any equivalent.” [Quran 112:1-4]

Islam calls for worshiping one unique God who created everything. And they were not commanded except to worship Allah, [being] sincere to Him in religion, inclining to truth, and to establish prayer and to give Zakah. And that is the correct religion. [Quran 98:5]

Quran is the only holy book that preserved its original script. It is as it was revealed to Muhammad (PBUH). The Almighty ensured the preservation of the Quran because the message of Muhammad (PBUH) is universal and final. “We have, without doubt, sent down the Message; and We will assuredly Guard it (from corruption)” [Quran 15:9]

The great miracles that the Quran include in the legislation, judgments, stories, beliefs, and science can not be produced by any creature, regardless of their knowledge. It tells a lot of past and future facts that can not be achieved by humans, especially at that time which was primitive in terms of modern technology and machinery.

Some of the verses in which addressed the Prophet (PBUH) mention some of the things that Allah warned against him, and some of verses admonish him: “Do not say of anything, ‘I will do that tomorrow,’ without adding, ‘God willing’” [Quran 18:23-24].
Islam is the fastest growing religion right now. The number of convert to Islam is increasing in major countries. Britain sees about 5,200 conversions a year. In America, nearly a quarter of Muslims are converts. A false religion basically will lose followers not gain them.

Muslims honor all prophets, and the belief in them is obligatory for every Muslim. Say, ‘We believe in God and in what was sent down to us and what was sent down to Abraham, Ishmael, Isaac, Jacob, and the Tribes, and what was given to Moses, Jesus, and all the prophets by their Lord. We make no distinction between any of them, and we devote ourselves to Him.’” [Quran 2:136]

Islam is based on the concept of justice in rewards and sanctions. No one was born sinner and none is expected to go to hell or heaven. It all depends on your deeds in this worldly life. So whoever does an atom’s weight of good will see it. And whoever does an atom’s weight of evil will see it. [Quran 99:7-8].

The righteousness in Islam is not defined by how many prayers you made or how days you fast but how you treat others. Abu-Huraira reported: A man said, “O Messenger of Allah, a woman prays in the night, fasts in the day, does many deeds and gives charity, yet she harms her neighbors with her tongue.” The Messenger of Allah, peace and blessings be upon him, said, “There is no good in her. She is among the people of Hellfire.” The man said, “O Messenger of Allah, another woman prays the obligatory prayers and gives bits of food in charity, yet she does not harm anyone.” The Prophet said, “She is among the people of Paradise.” Source: al-Adab al-Mufrad 117

Islam is compatible with human nature. It establishes an equilibrium between the body needs and soul demands. Seek, through that which Allah has given you, the home of the Hereafter; but do not forget your share of the world. And do good as Allah has done good to you. And desire not corruption in the land. Indeed, Allah does not like corruptors.” [Quran 28:77].