For Paul, it was God, by revealing his Son in Paul, who called him to be an apostle. Paul went immediately to Arabia and afterwards to Damascus, where he preached to the gentiles. A lot of study has gone into Paul's reference to God revealing his Son in him, rather than to him. Logically this suggests something rather different than a mere revelation.
OpinionI would say Apostle Paul wherever I use 'Apostle' as a title, in the same way as I would say Mr Smith, with 'Mr' capitalised. Less frequently, I would write 'apostle' uncapitalised if I did not intend it as a title, for example where 'apostle' is the subject of the sentence, and Paul is addressed. Use capitals to be on the safe side.
Yes it is, Paul was an apostle and was not associated with any one, particular church
No, Paul was an apostle of Jesus Christ. Apostle means, "One sent with a special message or commission". Jesus commissioned Paul as the "Apostle to the Gentiles" (Romans 11:13). Paul's ministry was in line with Jesus' doctrines. There were no conflicts.
The Apostle Paul was sent to the various gentile peoples of which the Galatians were one.
The Apostle Paul wrote 2 Thessalonians from Corinth.
There is no apostle named John Paul. There is an apostle named John and another apostle named Paul.
He called himself the Apostle to the Gentiles.
There is no apostle named John Paul. There is an apostle named John and another apostle named Paul.
Paul himself, in his epistles, never mentioned his birthplace. The Acts of the Apostles, written some decades later, has Paul say that he was from Tarsus.
People say that books state that Paul was a short man with a hooked nose.
Paul wasn't stoned - he was beheaded.
Yes, although he was not a disciple of the living Jesus, he was an apostle and traditionally referred to as "the Apostle Paul" or "Saint Paul".