He is called Spirit from God and Word of God in Quran. Thats pretty much it. The whole universe is a word of God "Be". He created Adam even without a mother. If he can create the whole universe with a Be, why would he need to "father" a man. If we assume he is incapable of creating a man without the prerequisite of "fathering" him, that would tantamount to a serious "deficiency" in God's power.