Full teaching study
Monotheism means there is only one God, and the Trinity fully affirms this. What biblical monotheism rules out is many gods (polytheism) and idols. It does not rule out personal distinctions within the one God. The Trinity is not a compromise of monotheism but a fuller revelation of it.
declares, 'I am the First and I am the Last; besides Me there is no God.' Isaiah 40-48 contains some of the strongest monotheistic statements in all of Scripture, written to mock the idols of Babylon (44:9-20). Yet in and 22:13, Jesus takes this same title for Himself: 'I am the Alpha and the Omega, the First and the Last.' The New Testament writers do not add Jesus to God as a second god; they identify Him as the one God of Isaiah.
In Paul reworks the Shema ('the LORD our God, the LORD is one'). He writes: 'for us there is one God, the Father, of whom are all things... and one Lord, Jesus Christ, through whom are all things.' He divides the words 'God' and 'Lord' from the Shema between the Father and Jesus. Scholars such as Richard Bauckham call this 'Christological monotheism': Jesus is included within the unique identity of Israel's one God.
The early Christians were strict Jewish monotheists. They would die rather than offer a pinch of incense to Caesar. Yet from the very beginning they worshiped Jesus, prayed to Him (), sang hymns to Him (), and called on His name (). This only makes sense if they understood Jesus as sharing the identity of the one God, not as a rival or second deity.
Why it matters: Muslims, Jews, and others often believe Christians worship three gods. We can say with conviction, 'We believe in one God, just as you do.' Then we explain that the one God has revealed Himself as Father, Son, and Spirit, supremely in Jesus Christ.
Scripture context & word study
KEY WORDS:
• ri'shon / acharon (Hebrew, רִאשׁוֹן / אַחֲרוֹן) — 'First' and 'Last' (). God is before all things and after all things.
• Alpha / Omega (Greek, Α / Ω) — first and last letters of the Greek alphabet (), the same claim Jesus makes for Himself.
• prōtos / eschatos (Greek, πρῶτος / ἔσχατος) — 'first' and 'last' (), used of Jesus in the Greek.
• mibbal'aday (Hebrew, מִבַּלְעָדַי) — 'besides Me' (), meaning 'apart from Me there is no God.'
• go'el (Hebrew, גֹּאֵל) — 'Redeemer' (). A kinsman-redeemer who buys back a family member; later applied to Christ who redeems us ().
• heis theos (Greek, εἷς θεός) — 'one God' (), echoing the Greek Shema.
• heis kyrios (Greek, εἷς κύριος) — 'one Lord' (). Kyrios was the Greek Old Testament word for YHWH.
• eidōlon (Greek, εἴδωλον) — 'idol' (). Paul affirms an idol is nothing in the world.
CONTEXT: Isaiah 44 speaks to Israel in exile in Babylon, surrounded by idols. God declares His uniqueness and His power to redeem. 1 Corinthians 8 addresses food sacrificed to idols in a city full of temples ('many gods and many lords,' 8:5); Paul answers with one God and one Lord.
Real-world use
Use when someone asks: 'Does the Trinity contradict monotheism?' in a church discussion, workplace conversation, youth setting, online comment, family conversation, or apologetics setting.
Common objection
“Christians worship three gods, which breaks the first commandment.” (Common from Muslims and Jews.)
Response strategy
Clarify: Christians reject three gods as strongly as anyone. Show alongside . Explain Paul's use of the Shema in . Stress that the first Christians were Jewish monotheists who died rather than worship Caesar, yet they worshiped Jesus. Invite the person to see the doctrine as one God more fully revealed.
Cross-references
; ; ; ; ; ; ;
Discussion questions & answers
1. What does monotheism deny, and what does it not deny?
Answer: It denies that there is more than one God (polytheism) and that idols are gods. It does not deny that the one God can exist as three distinct persons. The Bible teaches both one God and three persons.
2. Why is 'First and Last' significant when Jesus uses it?
Answer: In and 48:12 it is a title for YHWH alone, the only true God. When Jesus uses it in and 22:13, He identifies Himself as that same God.
3. How does Paul redefine the Shema in ?
Answer: He takes 'God' and 'Lord' from the Shema and applies 'one God' to the Father and 'one Lord' to Jesus Christ. He places Jesus inside the confession of the one God, not beside it.
4. How would you respond to a Muslim friend who says Christians worship three gods?
Answer: Agree that there is only one God (; ). Explain that Christians reject three gods, too. Then share that the one God has revealed Himself as Father, Son, and Spirit, and invite them to read the Gospel of John to see who Jesus claimed to be.
5. Why did early Jewish Christians worship Jesus?
Answer: They saw His miracles, heard His claims, and witnessed His resurrection. They understood Him to share the identity of Israel's God, so worshiping Him was not idolatry but obedience (; ).
Faithful application
Speak truth without arrogance; use Scripture directly; invite the person to consider what the text actually says.