The Apostle Paul would probably be considered a blasphemer by many
Trinitarians today, because in his greetings to the churches he
neglected to mention the Holy Spirit. In his introduction to the
Romans, he represents himself as an apostle of God the Father and
Jesus Christ, but nothing is said about any third person.
He also neglects to mention the Holy Spirit in the greetings of the
rest of his letters. His standard greeting is: “Grace be unto
you, and peace, from God our Father, and from the Lord Jesus
Christ” (I Cor. 1:3). The same greeting is repeated in II
Corinthians 1:3, Galatians 1:3, Ephesians 1:2, Philippians 1:2,
Colossians 1:2, I Thessalonians 1:1, II Thessalonians 1:2, I Timothy
1:2, Titus 1:4, and Philemon 1:3.
All of these greetings are without variation — the Holy Spirit
is consistently left out (a great oversight— indeed blasphemy,
provided the Trinity doctrine is correct).
Only in II Corinthians 13:14 is the Holy Spirit mentioned with God
and Jesus and there only in connection with communion or fellowship.
The Holy Spirit is not the third member of the Godhead.