They don't listen because fundamentalists like the aptly named Ham are not preaching the Gospel. Rather they offer an easily digestable Americanized product that combines a naive and anachronistic reading of the Bible with a good dose of pseudoscience (Ham is a leading proponent of young earth theories and teaches that humans coexisted with dinosaurs).
Ham "Radical New Approach" is more of the same. He argues that we need to return to a naive view of the Bible and view it as a scientifically and historically pristine textbook. How this approach is supposed to interest anyone with a halfway decent education is not explained. I'm also not sure what is "radical" about this...fundamentalists have been beating this drum for a long time now and all they've accomplished is an increasingly marginalized American church.
If you are truly interested in how to reach people with the Gospel, as opposed to how to drive people away, take a look at books by Brian Mclaren and Dave Tomlinson.