I remember one of those, perhaps the same one, who was doing that on every campus he could find, year and year out, and people would talk with him - more philo majors than like say, engineering or science majors who had, like real homework to do - I want to think his name was Jake, or Jeb, Jed or something like that, and I never found him that 'real', he was pretty skilled at taking what were most likely 'rote' questions/comments from the audience (that were the questions/comments that were asked every day, on each different campus) and working them into his sthick, but when he was really confronted by someone who knew something (thus counting out most students) or who could frame a really deep and profound question (also counting out most students) he lost it, and retreated into the hellfire, brimstone blither every time. (and I watched/listened to him a lot, stupidity really fascinates me, I can watch it for hours - and there was plenty of stupid going on on both sides of that debate.)
He'd fold like a house of cards when asked the real question about Leviticus - and if he was just doing a cafeteria deal of picking and choosing, which of course he was, everyone who is not a practicing Hasidic Jew is picking and choosing Leviticus, or, the even worse question of what Leviticus even matters given what Jesus said in John 13:34 and in other places.
And, preaching to the choir is not encouraged in the New Testament, pretty much strictly forbidden as a matter of fact, so going to a campus, even the UoT there in Weird Austin, is pretty much the calling, not the courage. Its not like he was going to be hurt or physically attacked - as those who he is preaching against frequently are.
And poor Africa, like the one thing they need is some roving Texas nutbag telling them their problems are all due to them being sinners. If he really wanted to help people in Africa, he would be working to build clean water supplies and get everyone a pair of flip-flops.
I do know some pretty smart people who are religious for reasons I sure can't fathom, but they don't think or act like these people are at all.