Both Christianity and Islam use the phrase "the Holy Spirit," and that shared vocabulary conceals one of the widest gaps between them. In mainstream Islamic belief, the Holy Spirit is the angel Gabriel — a created being, honored and powerful, but a creature. In Christianity, the Holy Spirit is God Himself, the third Person of the Trinity, co-equal and co-eternal with the Father and the Son. This is not a minor disagreement about an incidental figure. If the Spirit is an archangel, there is no third divine Person, and the Trinity collapses for a Muslim reader before it can be evaluated on the New Testament's own terms at all.

What Islam Teaches: The Holy Spirit as Gabriel, a Created Angel

Mainstream Muslim belief holds that "the Holy Spirit" (Ruh al-Qudus) referenced in the Qur'an is another name or title for the angel Gabriel (Jibril), the created being who delivered the Qur'an's revelation to Muhammad. The Qur'an itself never states this identification in so many words — no verse explicitly says "Gabriel is the Holy Spirit" — but two passages are read together to establish it in Islamic tradition: one identifies Gabriel as the one who brought down the revelation, and another attributes the same act to "the Holy Spirit":

"Say, 'Whoever is an enemy to Gabriel — it is [none but] he who has brought the Qur'an down upon your heart, [O Muhammad], by permission of Allah.'" — Qur'an 2:97

"Say, [O Muhammad], 'The Pure Spirit has brought it down from your Lord in truth to make firm those who believe.'" — Qur'an 16:102

Since angels in Islamic theology are created beings, "created from light" and "incapable of refusing to do Allah's will," the Holy Spirit understood as Gabriel is, on this reading, unambiguously a creature — powerful and honored, but categorically distinct from Allah and possessing no share in His divine essence. This matters because it removes any possibility of a Trinity from within Islamic theology at the level of the Spirit as well as the Son. If the Spirit is simply an archangel, then there can be no third divine Person for Christians to point to, and the entire doctrine of the Trinity collapses for a Muslim reader before it can even be evaluated on the New Testament's own terms.

What Christianity Teaches: The Holy Spirit Is God, Not an Angel

The Old and New Testaments describe the Holy Spirit with attributes and actions that Scripture reserves for God alone, and nowhere identify Him with any created angel — including Gabriel, who does appear by name in Scripture as a distinct, created being.

The Spirit is called God. Peter tells Ananias, "you have not lied to men but to God," in a passage that treats "the Holy Spirit" and "God" as interchangeable within a few verses (Acts 5:3–4). The Spirit is eternal: "how much more will the blood of Christ, who through the eternal Spirit offered Himself without blemish to God" (Hebrews 9:14) — angels, as created beings, have a beginning; the Spirit does not. The Spirit is omnipresent and omniscient: "Where can I go from Your Spirit? Or where can I flee from Your presence?" (Psalm 139:7); "the Spirit searches all things, even the depths of God... the thoughts of God no one knows except the Spirit of God" (1 Corinthians 2:10–11). No angel, including Gabriel, is ever described in Scripture as present everywhere at once or as searching the innermost thoughts of God Himself. The Spirit is the Creator: "The Spirit of God has made me, and the breath of the Almighty gives me life" (Job 33:4); "the Spirit of God was hovering over the surface of the waters" at creation itself (Genesis 1:2).

Most decisively, Luke's Gospel narrates a scene in which Gabriel and the Holy Spirit are explicitly distinguished from one another as two separate agents in the very same conversation:

"In the sixth month the angel Gabriel was sent from God to a city in Galilee called Nazareth... And the angel answered and said to her, 'The Holy Spirit will come upon you, and the power of the Most High will overshadow you; and for that reason the holy Child shall be called the Son of God.'" — Luke 1:26, 35

Here Gabriel is the speaker, and the Holy Spirit is the one he describes as coming upon Mary — the angel distinguishes himself from the Spirit in his own words, in the very passage most relevant to the virginal conception. As Sam Shamoun's research resource on this question observes, this "shows quite clearly that Gabriel and the Holy Spirit are not one and the same. In light of the preceding points, it becomes rather impossible to prove from the Holy Bible that the Holy Spirit is the angel Gabriel" (see "Is 'the Holy Spirit' Only Another Name for the Angel Gabriel?", Sam Shamoun, Answering Islam).

At Jesus' baptism, the same threefold distinction appears again: the Son stands in the water, the Spirit descends visibly as a dove, and the Father speaks from heaven — three simultaneous, personally distinct agents in one scene, none of them identified as Gabriel or any other angel (Matthew 3:16–17; discussed further in Is Allah the God of the Bible?). And the Great Commission's baptismal formula places "the Holy Spirit" in grammatically parallel position alongside "the Father and the Son" under a single shared divine "name" (Matthew 28:19) — a construction Scripture never uses to coordinate God with an angel, however exalted. Gerald Borchert, in the non-Calvinist New American Commentary, describes John 14:15–26 as "a trinitarian passage of the first order," in which "the Father as Sender, the Son as Requester and Departing One, [and] the Spirit as the abiding Presence" are distinguished while remaining unified in a single divine mission ^[1].

Interestingly, several Qur'anic passages themselves attribute to "the Spirit" functions the Qur'an nowhere assigns to Gabriel by name — Allah "breathed into [Adam] of My Spirit" at creation (Qur'an 15:29; 32:9; 38:72), and "We breathed into [Mary] of Our Spirit" at the conception of Jesus (Qur'an 21:91; 66:12). If "Our Spirit" in these verses is Gabriel, then Gabriel — a created being — is depicted as an agent through whom Allah personally imparts life at both the creation of Adam and the conception of Jesus, which raises for a careful reader the same kind of question the Bible resolves in the other direction: that the "Spirit" active in creation and conception is not a delegated creature but God's own life-giving presence.