It's sad how a man of God, now deceased, is judged by somebody that never knew him. It makes me wonder how such people would judge a true counterfeit preacher because most of them don't wear suits. Some of them will step on their stages wearing a faded t-shirt, blue jeans, sneakers, while wearing a Rolex. .
Still on about clothes?
How I judge a true teacher vs a counterfeit? Simple enough. I gave the answer above. They read the scriptures and expound via exegesis. Not make up false standards, and spew made up doctrines, about how people appear. Every crooked politician and lawyer on earth wears a suit and tie, so that's no standard. The Bible gives us the standards. Read Paul's letters to Timothy, and the letter to Titus.
It is a sin from hell to judge a man based on materialistic appearances.
Maybe your man in the video could have gotten to the word of God in the 15 minutes rather than lambasted young folks for their clothes and music, and 17 minutes before he got to scripture. When he does he mis-characterizes what is there. You only have to go back one chapter to know what it means that many believed him. See what is written.
When they heard these words, some of the people said, “This really is the Prophet.” Others said, “This is the Christ.” But some said, “Is the Christ to come from Galilee? Has not the Scripture said that the Christ comes from the offspring of David, and comes from Bethlehem, the village where David was?” So there was a division among the people over him. Some of them wanted to arrest him, but no one laid hands on him.
John 7:40-44 ESV
So these many who believed him, believed what he had said, but were not converted, they believed him but not in him. There is a difference, they questioned whether he was the Christ. Its when Jesus began to convict them of sin they stopped believing what he was saying because they believed in their pedigree, they were the offspring of Abraham. So they had no repentance. They couldn't believe that they were condemned in their sin.
Repentance is to know you are convicted of sin, and to trust Christ for forgiveness, in his mercy. This is Salvation.
So in short these Jews, were believing what Jesus was saying, and questioning as to whether he is the Christ, until he began to convict them of sin. Then because they couldn't accept conviction, they had no repentance, and therefore were not saved.
They weren't fake Christians. They never believed in salvation through Christ. They believed salvation through pedigree, through flesh.