What does Paul teach that so many Christians refuse to believe? Here are some examples.
"...seeing that out of Him and through Him and for Him is all: to Him be the glory for the eons!" (Romans 11:36)
They do not believe that "ALL things" are from God. They insist Paul meant all "good things".
"...our Savior, God, Who wills that all humanity be saved and come into a realization of the truth. For there is one God and one Mediator of God and humanity, a Man, Christ Jesus, who is giving Himself as a correspondent ransom for all." (1 Timothy 2:3-6)
"Faithful is the saying and worthy of all welcome (for for this we are toiling and being reproached), that we rely of the living God, Who is the Savior of ALL humanity, especially of believers." (1 Timothy 4:10)
They do not believe all humanity will be saved as the result of the ransom Christ Jesus paid for all. They insist Paul meant that God is "offering" to save all people, and will ransom only those who accept His offer.
"...reconciling the world to Himself, not counting their trespasses against them, and He has committed to us the message of reconciliation..." (2 Corinthians 5:19)
They do not believe God is reconciling the world to himself. They insist Paul meant that only those in the world who choose Christ are reconciled to God.
So, do you believe Paul or someone else?