What is belief in Allah?

Question: What is belief in Allah?
ANSWER
The first fundamental principle of îmân is to have belief in Allah. The expression “billahi” in the Âmantu conveys the meaning of having belief in Allahu ta’âlâ’s existence and oneness.

The Creator of everything is Allahu ta’âlâ. It is He who has created everything on earth and in the heavens, substances, objects, properties, events, powers, laws, and connections. There is no Creator besides Him. It is purported in the Qur’ân al-karîm:
(It is Allah who has created everything.) [Sûrat-uz-Zumar, 62]

(It is Allah who has created you and what you do.) [Sûrat-us-Saffât, 96]

(Allah, your Rabb, is the Creator of all things.) [Sûrat-ul-Mu’min, 62]

(Allah is the Creator of everything. He is the One.) [Sûrat-ur-Ra’d, 16]

(He created everything.) [Sûrat-ul-An’âm, 101]

(Creating belongs to Him.) [Sûrat-ul-A’râf, 54]

Allahu ta’âlâ is One. There is no ilâh besides Him. It is purported in the Qur’ân al-karîm:
(Your Ilâh is one Ilâh. There is no ilâh except Him.) [Sûrat-ul-Baqara, 163]

(There is no ilâh except Allah.) [Sûrat-ul-Baqara, 255; Sûrat-u Âl-i ‘Imrân, 2; Sûrat-un-Nisâ’, 87; Sûrat-u Tâhâ, 8; Sûrat-ut-Taghâbun, 13]

(There is no ilâh except Him.) [Sûrat-u Âl-i ‘Imrân 6, 18; Sûrat-ul-An’âm, 102; Sûrat-ut-Tawba, 31; Sûrat-u Hûd, 14; Sûrat-ur-Ra’d, 30; Sûrat-ul-Mu’minûn, 116; Sûrat-ul-Qasas 88; Sûrat-u Fâtir, 3; Sûrat-uz-Zumar, 6; Sûrat-ul-Mu’min 3, 62, 65; Sûrat-ul-Muzzammil, 9]

(Do not say that there are three gods. Allah is the only One Ilâh.) [Sûrat-un-Nisâ’, 171]

(He is the only One Ilâh.) [Sûrat-ul-An’âm, 19]

(Your Ilâh is the One Ilâh.) [Sûrat-un-Nahl, 22]

(Your Ilâh is One.) [Sûrat-us-Saffât, 4]

(He, Allah, is One.) [Sûrat-uz-Zumar, 4]

(He, Allah, is the One.) [Sûrat-ul-Ikhlâs, 1]

(Do not take for yourselves two ilâhs. He is the only One Ilâh. Then fear Me alone.) [Sûrat-un-Nahl, 51]

(Your Ilâh certainly is Allah, besides whom there is no ilâh.) [Sûrat-u Tâhâ, 98]

(O My Messenger! We revealed each prophet before you, “There is no ilâh except Me. Worship Me.”) [Sûrat-ul-Anbiyâ’, 25]