If one pursues youtube these days, one will find a number of videos advocating
the flat earth theory. As there has been a sort of resurgence in this nonsense
theory, there have been a number of debates and discussions on this issue. The Non Sequitur
youtube page has hosted a number of them.
Robert Sungenis, a Catholic apologist who shares many of the assumptions (*) of many flat earthers (e.g., young earth creationism; geocentrism [some, not
all, flat earthers hold to a stationary earth as Sungenis does]) has an 800-page book that will be coming out soon,
Flat Earth, Flat Wrong: An Historical,
Biblical and Scientific Analysis. Additionally, on his Website, Sungenis
has a 39 page paper refuting this movement: