Romans 8: Paul uses the term Spirit of God and Spirit of Christ interchangeably, but as a force of the Father or Jesus, and not as a separate person of the Trinity.
1 Corinthians 12: Paul still uses the term ‘Spirit of God’ to preface the remainder of the verses that he speaks about the Spirit.
Galatians 5: Paul does use the term Spirit as a standalone, yet never indicates that the Spirit is God, rather, the verses indicate what he said in Corinthians and Romans - that the Spirit is a mechanism of Jesus and/or God the Father.
No Trinitarian verses in Paul, I’m afraid.
Well...let's just ignore or reinterpret these as well:
1Cor 1:24 But unto them which are called, both Jews and Greeks, Christ the power of God, and the wisdom of God.
2Cor 4:4 In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
2Cor 4:6 For God, who commanded the light to shine out of darkness, hath shined in our hearts, to [give] the light of the knowledge of the glory of God in the face of Jesus Christ.
2Cor 5:19 To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
2Cor 5:21 For he hath made him [to be] sin for us, who knew no sin; that we might be made the righteousness of God in him.
2Cor 13:14 The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Ghost, [be] with you all. Amen.
No Trinitarian verses in Paul, I’m afraid.
Mat 22:37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
1Co 6:14 And God hath both raised up the Lord, and will also raise up us by his own power.
Rom 4:24 But for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead;
Rom 8:11 But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.
2Co 3:17 Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty. 2Co 10:17 But he that glorieth, let him glory in the Lord.
2Co 13:14 The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Ghost, be with you all. Amen.
Eph 4:5 One Lord, one faith, one baptism,
Act 10:48 And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
1Co 6:11 And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God.
Jas 5:10 Take, my brethren, the prophets, who have spoken in the name of the Lord, for an example of suffering affliction, and of patience.
Mat 28:19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
The only way you can miss the Trinity in the scriptures is to avoid studying the scriptures (2Tim. 2:15) and reading only the talking points put out by your religion...
God is Lord...
Jesus is Lord...
The Holy Spirit is Lord...
They are Three, but, They are One...
The Father, the Son and the Holy Spirit are the Lord...
The Trinity is clearly in Paul's epistles as well as the rest of the scriptures...
Regardless of the fact that it took your religion 400 years to find the Trinity, or whether they found the Trinity or not is is inconsequential...Because He (the Trinity) was there all the time...
And it's very likely your religion never did find the Trinity in the Scriptures...The fact of the Trinity in the scriptures was likely so prevalent amongst the 'heretics' in that first 400 years, that your religion had to latch onto the idea and claim it for it's own to gain support for it's own man-made authority...