The Stage is Yours.

[Rayaan]

It is not a grammatical error, but rather a style of speech. For example, the landlord of a house can say something like "We demand X and Y" or that "We have created this and that," but it would be absurd to think that the landlord by saying "we" is only referring to himself. He is referring to other people along with himself and hence the use of "we." This is the same style of speech used in some verses of the Quran.

The following article provides a good answer to why there is "we" in the Quran:

http://www.islam101.com/tauheed/AllahWE.htm

Question. We already know Allah our lord is One. As in Surah al-Ikhlas 112:1-4. But why does Allah the Lord use the word “We” to refer to Himself in many verse or ayat in the Qur’an? For example He says in Surah al-Anbiya’ 21:107 “And We did not send you (O Muhammad) except as a mercy to the world.” The word “we” is plural, more than one. Why does Allah use “We” instead of “I” to refer to Himself? (Izani Mahayudin bin Abd Aziz, Malaysia)

Answer. The Qur’an says very clearly that there is only One God, Allah. “There is no god but Allah” is the basic principle of Islam. There is no ambiguity about this fact in the Qur’an and there are hundreds of ayat or verses of the Qur’an that make this point very clear. Belief in more than one God is Shirk (polytheism) and a major sin according to the Qur’an.

Whenever in the Qur’an Allah is mentioned in the third person there are always singular pronouns used, such as He, him (Huwa or Hu). Whenever Allah is spoken to in the second person there are also singular pronouns, such as Thou, Thine and Thee (Anta, Ka). However only in the first person some times the pronouns I, My or Mine (Ana, Iyaya, ya) are used and sometimes We, Us and Our (Nahnu, Na) are used.

This is a style of speech. Sometime the speaker says I and sometime says we. We also use that in our conversations. In the Qur’an you will see that often the first person singular such as I or My is used, when Allah speaks about His love, care and closeness and forgiveness for His servants. In a similar way the first person plural is often used when Allah speaks about His power, majesty, glory, great deeds or when He speaks about His anger and wrath for the sinners and criminals. (This is, of course, the general use. Sometime the reverse is also the case, depending on the context of the Surah.)

Christian writers in their desperate desire to prove their doctrine of Trinity have sometime interpreted some Biblical passages where first person plural is used to suggest that this means the “Divine Trinity”. For example in the Bible it is mentioned, “Then God said, “Let us make man in our image¦” (Genesis 1:26). Christian writers contend that this means that there is plurality in God (We seek Allah’s forgiveness for mentioning this blasphemy.) Sometime Christian missionaries also go to simple Muslims and try to confuse them by taking some verses from the Qur’an and tell them that the Qur’an also supports such doctrines. I tried to explain this point in some detail, because I have often heard this type of questions from some Christians.