Here the sources: a) Matt Dillahunty: The Superiority of Secular Morality https://www.youtube.com/watch?v=cq2C7fyVTA4

b) Atheist Debates – Dillahunty vs Slick – Is Secular Humanism superior to Christianity? https://www.youtube.com/watch?v=EKlycI9ZKsY and supplementary…

c) Atheist Debates – Morality https://www.youtube.com/watch?v=QAQFYgyEACI

If you’re interested to find out Matt’s views about it, I would start with a) and c) to get a rough picture and watch (if at all) b) last, because it’s so much longer. You’re welcome.