Acts17apologetics trust their saints; did Paul confirm Jesus' message?

In answer to the video "Can We Trust the Apostle Paul? (Answering Islam Part 19)"

Paul was spending all day in his writings trying to gain credibility as seen in the Epistles, saying he was equal to, if not greater, than the Apostles of Jesus and making statements such as even if angels were to come down, and they said differently than what he was preaching, not the believe the angel. That is in stark contrast with the Paul described in Acts, supposedly written by his disciple Luke, where he is more of a team player, subordinated to the early apostles of Jesus.

And yet the man never once met Jesus in his life, and here he was coming to those that knew and followed him, telling them they were all wrong the whole time. He never even quotes him once in any of his writings, doesnt show any knowledge about the historical Jesus at all. He was all for the assimilation of the Gentiles into the Judaic faith, and the Jews compromising on their faith as opposed to the other way around. Thus, his focus on grace as opposed to law.

He asserts his authority before the Greek people, but never to the community in Jerusalem, and more particularly James, Jesus' brother. James' approval was necessary for anyone claiming to preach Jesus' teachings as explicitly stated in the church-rejected Pseudo-Clementine chapter 4 and implicitly alluded to by Paul in 2Cor3:1-6,1 Cor9:2,Gal1:20-24. He sharply disagrees with James and what Jesus taught when he preached salvation through faith alone Rom3:30. James, like all prophets of the scriptures, repeated the basic principle that faith and deeds go hand in hand and that one without the other is useless James2:19-22. So important are the good deeds for one's salvation in the Hereafter that the prophets prayed God to remember these deeds for the final judgement Neh13:14.

Paul's authority was constantly challenged, not only by Christians but by Jews whom he went seeking in their synagogues. In Acts21, Paul is asked to partake in the Nazirite purification sacrifice to prove he was still "kosher". After all he is the one to have initiated the deceptive missionary modus operandi (Jew to a Jew, gentile to a gentile etc). This challenge to Paul shows something important, Jesus' earliest followers were still practicing sacrifices after Jesus' death and never believed Jesus abolished the mosaic law, much less the sacrificial system. Why would he, when the HB to which he abided to the letter, explicitly says that all the mosaic law including animal sacrifices will be reinstated once the 3rd temple is built.

As to the Christians that challenged him, he accused them, more particularly Jesus' disciples and apostles of being false and deceitful 2Cor11:13-15, sarcastically said they "seemed to be pillars" of the church Gal2:9, even cursed them Gal5:12. It took 3 angelic appearances to confirm and justify Paul's abrogation of the mosaic dietary laws and others laws, to Jesus' early disciples. Peter reconsidered his firm stance on abiding by these laws, when he was eventually convinced that abrogating dietary laws like not eating pork would result in Romans being saved from Hell. If Jesus' message was what Paul said it was the entire time, why did it take a vision, reinforced repeatedly, for Peter to do something that Jesus had allegedly already instructed him to do? Sometimes Christians try finding justification for Paul's dietary reforms in Jesus' saying

Mk7:14-19"There is nothing that goes into a person from the outside which can make him ritually unclean. Rather, it is what comes out of a person that makes him unclean...Nothing that goes into a person from outside can really make him unclean, because it does not go into his heart but into his stomach and then goes on out of the body".

If all food is good for consumption regardless of pre meal rituals because it merely enters stomach and not the heart then why are James and Paul himself so concerned about food offered to idols Acts15,1Cor10? Jesus here wasnt denying the law, rather infusing it with a much needed spiritual dimension, as he applied himself to do all throughout his career. Similarly, the sabbath, whose transgression is punishable by death according to the Law upheld by Jesus, became a matter of free choice with no consequence Col2:16-17,Rom14:4 thus easing the way further for any potential converts. 

Paul, who was at most a hellenezied Jew, was explaining Jesus teachings in ways that were unheard of by Jesus' disciples. Paul's letters were written about AD 50-60, while the Gospels were not written until 60-90 meaning Paul's theories were already established before the unknown writers of the gospels started their works and earlier christian thought was quickly branded heretical.

After Jesus' death, Paul's main problem was to convince his Jewish audience that the messiah's death, without accomplishing any of the messianic criteria, instead of being a failure was actually a necessity. He did so by introducing the doctrine of total depravity, making all humans de facto sinners and therefore in need of an atoning sacrifice Rom7:14-25,Rom3:10-11,5:13,8:7-8,1Cor2:14,Eph2:1-3,Titus3:3. His addressees however already believed in the resurrection of the dead, in a just God who forgave the sins of a penitent heart. Nothing was missing in their system that Jesus' sacrifice and resurrection could fix. Paul's redeeming hero was a redundancy to them, so he was obviously met with fierce resistance wherever he preached his unscriptural ideas. This led him to eventually turn to the gentiles among whom he found a much more favorable audience.

Paul's major tenet is that man is a slave to sin, cannot reach holiness by his actions, and must be "saved" from inherent damnation. One by his own will cannot choose to turn to God unless by God's grace. The doctrine was further developed by Augustine of Hippo but some righteous early christians objected and were quickly branded as heretical. Among Augustine's powerful arguments was that human depravity could be demonstrated by the "involuntariness" of the male erection. This base impulse belonged to nature, or the flesh, not to the spirit. In his logic, because of man's uncontrolable urges, it was women who had to be constrained. Tertullian taught when a parent sinned, this physical taint of the soul was passed on to children.

Paul applied himself to give everyone a reason to reconsider Jesus’ death, now turned into a suicide mission planed since the beginning of creation. But the cursed law of Moses stood in his way. If one could find salvation through obedience to the law, as all past prophets including Jesus taught, then it would make Jesus' supposedly purposeful sacrifice redundant 

Gal2:21"If righteousness come by law, Christ is dead in vain".