Does Islam believe in several gods because the Qur'an uses the word 'We' when God speaks in the Qur'an?
Islam is a strictly monotheistic religion. It believes in and adheres to uncompromising monotheism. It believes that God is one, and unique in His attributes. In the Qur'an, God often refers to Himself using the word 'We'. But this does not mean that Islam believes in the existence of more than one God.
Two types of plural
In several languages, there are two types of plurals, one is a plural of numbers to refer to something that occurs in a quantity of more than one. The other plural is a plural of respect.
a. In the English language, the Queen of England refers to herself as 'We' instead of 'I'. This is known as the 'royal plural'.
b. Similarly in Arabic, when Allah refers to Himself in the Qur'an, He often uses Arabic word 'Nahnu' meaning 'We'. It does not indicate plural of number but plural of respect.
Tawheed or monotheism is one of the pillars of Islam. The existence and uniqueness of one and only one God is mentioned several times in the Qur'an. For instance in Surah Ikhlas, it says : "Say He is Allah the One and Only." [Al-Qur'an 112: 1]