Why do some people think St. Paul was a false apostle?

You mean in the New Testament, accusing Paul of being a false apostle? Well, one thing that comes up is that he claims to be an apostle. And the definition he gives for someone who is an apostle is someone who has seen Jesus Christ. Now, he heard a voice and saw a light, but whether he actually saw Jesus face to face, that's another story. So according to Paul's definition, he fits the one who has seen Jesus, because he saw the light that Jesus presented Himself with to Saint Paul. And he heard the voice of Jesus. That's not debatable. And Paul was telling them a lot of things they had to do. I mean, if someone comes in and starts telling you, you have to do this, that, the other thing, in a moral sense, not intellectual. I mean, he is like a father watching over the morals of his daughter. That can get pretty intrusive. And you get right down to the nitty gritty of life. And some people didn't like that, and felt they had a right to question his authority. You come in here and tell us to do all this stuff. So it's good that he answers the question, because once that's out of the way, the authority factor, then you can start getting down to business and doing the things you should do. So people may have accused him of being a false teacher for that reason. Who are you to come in and tell us how to live our lives, especially as detailed as you make it? The other thing was, he's like Jesus. He pushed aside the Pharisees. They were the top dogs of Judea, Jerusalem, until Jesus came along and stole the crowds. Not that the Pharisees had huge crowds. They would stand on the street corners or in the middle of the intersection to be noticed by people. So we know they didn't have a lot of followers, but Jesus, wherever He went, He had followers. People loved Jesus because He was real. And so the Pharisees were jealous of Him. And that's the reason they incited the crowds to kill Jesus. And the same was true for Paul, because the Pharisees became his enemy. In that place they were called Judaizers, not Pharisees so much, but they were trying to get the people to be circumcised and follow ritual laws of Old Testament Judaism in addition to doing their Christian stuff. Let's say that was the compromise they reached in their own mind. Let's do both Judaism and Christianity, and that way everybody will be happy and Paul will not be slating our religion. But it didn't work that way, because Paul says, no, that's not the way it works. The only way it works is you have the true religion and you practice that. Everything else doesn't get a place at the table. And that's what raised their hackles, and they went after him and called him a false prophet. So there were many reasons why Paul was attacked. And if you're going to try to go for the jugular, you attack someone's credibility. Once you ruin their credibility, good luck. They're not going to be able to recover.