Ephesians 4:5

³ and with diligence to preserve the unity of the Spirit through the bond of peace.

⁴ There is one body and one Spirit, just as you were called to one hope when you were called;

one Lord, one faith, one baptism;

⁶ one God and Father of all, who is over all and through all and in all.

⁷ Now to each one of us grace has been given according to the measure of the gift of Christ.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

1 Corinthians 8:6
yet for us there is but one God, the Father, from whom all things came and for whom we exist. And there is but one Lord, Jesus Christ, through whom all things came and through whom we exist.
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1 Corinthians 12:13
For in one Spirit we were all baptized into one body, whether Jews or Greeks, slave or free, and we were all given one Spirit to drink.
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1 Peter 3:21
And this water symbolizes the baptism that now saves you also—not the removal of dirt from the body, but the pledge of a clear conscience toward God—through the resurrection of Jesus Christ,
Read in context
Romans 3:30
since there is only one God, who will justify the circumcised by faith and the uncircumcised through that same faith.
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Galatians 3:26–28
You are all sons of God through faith in Christ Jesus.
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Matthew 28:19
Therefore go and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit,
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Zechariah 14:9
On that day the LORD will become King over all the earth—the LORD alone, and His name alone.
Read in context
1 Corinthians 1:13
Is Christ divided? Was Paul crucified for you? Were you baptized into the name of Paul?
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