Paul's gospel is completely misunderstood. The former Pharisee did not take the Gospel of the Circumcision (Peter's) to the nations, yet the Gospel of the Uncircumcision (Galatians 2:7-8). This gospel is COMPLETE grace apart from works of the law (Ephesians 2:8-9). Paul taught that the completed work of Christ Jesus saved ALL mankind (1 Timothy 4:10), yet each in their own order (1 Corinthians 15:23). It is a gospel of freedom of which no man can add or subtract (Galatians 5:1). Be at peace! (Philippians 4:6-7)

The core of Paul's Gospel:
For I give over to you among the first what also I accepted, that Christ died for our sins according to the scriptures, and that He was entombed, and that He has been roused the third day according to the scriptures... (1 Corinthians 15:3-4)

The doctrines of the trinity, immortal soul, hell and free will are doctrines of demons meant to keep one from ACTUALLY BELIEVING the above verse (1 Timothy 4:1).

Resources for Paul's Gospel:
MartinZender.com
Concordant.org
Tentmaker.org
Studyshelf.com