Todd that occurrence of when Peter preached to Cornelius and the first gentiles is recorded in the book of acts, and its the same author of the book of acts seems to legitimize Paul's apostleship and even records the disciples and Paul frequently convening and discussing matters of the the word of God.
At least you are acknowledging that the Book of Acts isn't proof of Paul's apostleship. If you remove the veil of indoctrination, the book of Acts is clearly evidence that Paul and the original disciples diasgreed on many things and there is never any record of agreement from the "discussions" you reference. Paul even arrogantly claims the Apostles in Jerusalem and their doctrines mean nothing to him in his writings. When look at from a purely objective viewpoint the book of Acts paints a strained relationship at best between the Apostles and Paul and a downright rivalry at worst, that makes todays disagreements between denominations and sects of Christianity look downh right tame.
As far as Luke's testimony goes in Chapter one of his gospel, he claims "it semed good to him" to record the events he witnesed. In other words Luke is stating (like Governor Cuomo does at the beginning of his Coronavirus updates) I'm just stating the facts. Luke makes no illusion that his writings are the inspired "Word of God". The book of Acts likewise is squel of the gospel of Luke. It was the instituational church of the second to fourth centuries that inflated the book of Acts to the status of the inspired Word of God.
So thats at the very least two books after the initial 4 gospels that confirm Pauls apostleship.
Yeah no. You are trying to deduce something that is not explicitly stated.
If one was led to believe that Paul's apostleship wasn't divinely appointed they would also have to completely disregard the book of acts or at the very least label it another fallible book w/ errors that somehow made into into the Bible.
I disagree. The Bible is man's infallible record of God's interaction with human's through the Hebrew nation of Isreal and the Hebrew Sect ("The Way") that spread the good news of the Messiah's work on the Cross and one rogue member of the Hebrew faith from the trive of Benjamin (the ravenous wolf) who ventured out to spread that good news to the Gentiles. The bible contains some of the direct "words of God" as recorded by man, but to claim every single word in the Bible is the actual word of God is quite ridiculous.
If God wanted us to have his perfect unadulterated word in a single book, he could have done a much better job than the convoluted, mistranslated, and corrupted book we have now. But the Bible with all it's imperfections is simply a part of the vast veiled journey we are on in this temporary age we know reside in. As Paul himself claimed, right now we see a dim reflection in mirror, but ihnthe ages to come we will see face to face. Right now we now in part, but in the ages to come we will know in full.