I think that it is understood here on this forum that the entire Bible is inspired by God, that He put His thoughts into the minds of the writers of the Bible books. That would include I Corinthians.
You must accept as inspired water baptism before you get the holy spirit that is the description Jesus provides Matthew 3:15-17 He says follow him Matthew 16:24
1. There is no record of Paul's water baptism
2. Yahweh had to send 2 witnesses to give him message - Acts 21:4, 10 did not talk to him directly
3. He had thorn of the flesh - 2 Corinthians 12:7-9, Matthew 13:7
He fell to the thorns says Jesus. Who has ears let him hear Matthew 13:9
If Yahweh did not talk directly to him how can you say his words are inspired by Yahweh?