Muslims deny that God is triunity , yet in the Quran God is referred to with the plural pronoun" we".  In Sura 2:23,106, Sura10: 94, and Sura 66:12 where  it says that God and the Holy Spirt breathed into Mary.  Also in the Quran it says that the Spirit appeared to Mary in the form of a man.  Muslims can not explain the plurality of God and also his oneness. But Christian do throughout the Bible because God revealed himself that way.