Apostolic authority is a key concept in Christian apologetics, with Matt Slick arguing that the Roman Catholic and Eastern Orthodox churches lack this authority due to their inability to perform miracles like the apostles. Meanwhile, a caller discusses the possibility of Christians being part of biker clubs, and Matt Slick explains the importance of differentiating between worldly and Godly activities. The conversation also touches on the rapture, with Matt Slick presenting an argument that the wicked are taken before the rapture, and the day of the Lord comes like a thief in the night, which he believes refers to the rapture and the new heavens and new earth.