The use of absurdity seems more like a tool to enforce group norms than a means of conversion. That doesn't mean the beliefs aren't absurd, just that pointing out the absurdity of outsiders is common practice by in-group members. Most creationist-minded believers would use some similarly absurd way of describing evolution, with the group benefit of passing along "evolution is stupid" meme. That said, it is important to start to tease apart just how many other enforcement strategies are out there, as they are going to need to be dealt with one by one.