The "reaction" videos were a series of five or six. Obviously, the atheist was reacting (and, in this case, correcting all the stuff Johnson was getting wrong). But it was scary that someone could rise to such a high position while holding such (frankly) ignorant beliefs (e.g. that the Founders were all Xian). Just search YouTube for "Mad House Speaker" if you want to view all the videos. The first video features Andrew Seidel (head of an organization for separation of church and state). The first video is about us being a Xian nation (which we aren't). The other videos are solo reactions to Johnson's speech/sermon.

Mike Johnson and his wife are speakers for organizations like Answers in Genesis, which implies he actually is YEC (since AiG is YEC). They are Xian nationalists.

And he's second in line for POTUS, after Kamala. Wishing Kamala a looooong, healthy life.