This is the age-old story of picking sides that has been going on now since the dawn of mankind. The believers want to think and portray it as Matt Dillahunty being stumped by a garden-variety Christian. Matt has done hundreds of debates. He takes on all-comers and does not vett his opponents. He did not know who this guy was and took the debate as a last-minute thing. While he has a call-in show where he accepts calls from anyone and some of the callers are real loons, when he debates, he expects opponents that are of stature such as William Lane Craig to have theology degrees or are priests or apologists.
This guy was an internet shock jock conspiracy theorist who just wanted to engage in personal attacks and make it all about Matt instead of a cerebral discussion of whether or not Christianity or secular humanism is better for society. But that wasn't what the shock jock wanted to do. He wanted to talk about sex by 9-year-olds and transgenders.
Personally, I think that secular humanism has its drawbacks as it does not include morality as a virtue and a better way of life. But to have a premise that Christianity is "true" because it teaches moral values that are good for society is using sleight of hand. When you take the bible in full, it simply cannot be justified., Yes, helping those in need is good. Yes, forgiving others is good, etc. etc. but those things are just copies of what was and is taught by nonbelievers in rising humans, talking snakes, heaven and hell, rising humans, blood sacrifices.