Loading page content…
Both Christianity and Islam affirm one God. This step explores Tawheed — Islam's doctrine of absolute divine oneness — what it means, its three dimensions, and how Islam views the Trinity with respect but also with clear disagreement.
In Step 01, we saw that Muslims and Christians both worship the One Creator — the God of Ibrahim (Abraham), Musa (Moses), and Isa (Jesus) (Peace Be Upon Them All). The critical question is not whether God is one, but what that oneness means.
Christianity generally teaches that God is one in three persons — the Father, the Son, and the Holy Spirit. Islam teaches that ALLAH is absolutely One — not a unity of persons, not a triune being. This distinction is not a minor theological detail. It is the defining difference between Islam and Christianity, and it is the subject of this step.
The Arabic word Tawheed comes from the root meaning "to make one" or "to declare oneness." It refers to the Islamic doctrine that ALLAH is One in every possible sense — in His being, in His attributes, and in His exclusive right to worship.
Islamic scholars describe Tawheed across three interconnected dimensions. Understanding all three is necessary to understand what Muslims mean when they say "ALLAH is One."
1. Tawheed ar-Rububiyyah — Oneness of Lordship
ALLAH alone is the Creator, Sustainer, and Controller of all things. He alone brings life and death, sends rain, governs the cosmos, and holds all existence together. No created being shares in this. Even Christians who acknowledge God as Creator would agree with this dimension in principle.
2. Tawheed al-Uluhiyyah — Oneness of Worship
ALLAH alone deserves to be worshipped. Prayer, supplication, love, fear, hope, gratitude, sacrifice, obedience — all these acts of worship must be directed to ALLAH alone. Directing any of them to a prophet, saint, angel, or any created being is the gravest sin in Islam, called shirk (associating partners with ALLAH).
3. Tawheed al-Asma wal-Sifat — Oneness of Names and Attributes
ALLAH's names and attributes are unique to Him. We affirm them as He described Himself in the Quran and through the Prophet ﷺ (Peace Be Upon Him), without distorting, denying, or comparing them to the attributes of created beings. No created thing shares in ALLAH's divine attributes.
Quran 21:25
This section addresses the Trinity directly — not to mock Christian belief, but to explain clearly why Islam rejects it. Christians believe in the Trinity in good faith, and Islam acknowledges that Christians are People of the Scripture who worship the Creator. What Islam argues is that the doctrine of the Trinity represents a later development that departed from the original message of Isa (Jesus) (Peace Be Upon Him).
The Quran addresses the Trinity explicitly and directly:
Quran 4:171
Quran 5:73
Islam's rejection of the Trinity is not based on hostility to Christianity. It is based on the Islamic understanding that ALLAH is utterly unique and absolutely indivisible. The idea of three divine persons — even if unified in substance — introduces a kind of composition into the divine nature that Islam holds is incompatible with the absolute oneness of ALLAH.
Islam also argues from a historical angle: the Trinity as a formal doctrine was defined through church councils over centuries after Isa (Jesus) (Peace Be Upon Him). Islam teaches that the original message of Isa (Jesus) (Peace Be Upon Him) was Tawheed — the worship of ALLAH alone — and that this message was gradually changed.
Shirk is the Arabic word for associating partners with ALLAH. It is the most serious sin in Islam — the one sin the Quran says will not be forgiven if a person dies while holding it. It includes:
For a Christian reader: Islam considers the worship of Isa (Jesus) (Peace Be Upon Him) as God, or as part of a Trinity, to fall into shirk — not because of disrespect for Isa (Jesus) (Peace Be Upon Him), who is deeply honored in Islam as a prophet and messiah, but because it directs worship to a created being.
This is a clear, honest statement of Islamic belief. It is not an accusation but a theological position. Islam invites Christians to consider this position with sincerity and reason.
The Quran is explicit and repeated on this point. ALLAH does not have a son — not in the literal sense, not in any theological sense. The concept of divine sonship — whether understood physically or metaphorically as a special divine relationship — is rejected in Islam because it implies that ALLAH is in some way dependent on, or relationally defined by, a created being.
Quran 112:3–4
Islam affirms that Isa (Jesus) (Peace Be Upon Him) was born from Maryam (Mary) (Peace Be Upon Her) without a human father — a miraculous birth by ALLAH's command. This makes Isa (Jesus) (Peace Be Upon Him) extraordinary, but it does not make him divine. ALLAH created the soul of Isa (Jesus) (Peace Be Upon Him), as He created Adam (Peace Be Upon Him) — without a human father — and neither is God.
Islam does not present Tawheed as a new teaching. It presents it as the original, unchanged message that ALLAH sent through every prophet throughout history. Adam (Peace Be Upon Him) worshipped ALLAH alone. Nuh (Noah) (Peace Be Upon Him) called his people to ALLAH alone. Ibrahim (Abraham) (Peace Be Upon Him) broke idols and called to ALLAH alone. Musa (Moses) (Peace Be Upon Him) delivered the Torah with the first commandment: worship the Lord your God alone.
Islam teaches that Isa (Jesus) (Peace Be Upon Him) was also a prophet of Tawheed — that he called his people to worship ALLAH alone, without partners. The deification of Isa (Jesus) (Peace Be Upon Him) that developed in later centuries, from the Islamic perspective, was a departure from his original message.
Quran 16:36
Muslims often note that Tawheed is the most rational understanding of God. If the Creator is perfect, He cannot lack anything. If He lacks nothing, He does not need a son, a partner, or a co-eternal being. If He is all-powerful, He is not limited by a three-person structure. If He is unlimited, He cannot be composed of parts.
From this perspective, Tawheed is not just a theological doctrine — it is the most logically consistent description of a truly infinite and perfect God. Islam invites the reader to evaluate it not just as a religious claim but as a rational one.
Next Step
Islam requires belief in all the prophets ALLAH sent — including the ones Christians know from the Bible. The next step explores prophethood in Islam: who they were, what they taught, and how Muslims view them. Continue to Step 03.
Continue to Step 03 — Prophets in IslamNote: This lesson provides general Islamic education. It is not a personal fatwa or religious counseling. If you have a specific personal situation, ask a qualified scholar or trusted local Islamic authority.