Mockery comes, I think, from hate.  I've been thinking about this business of "hating" Christians or "hating" Islam or whatever.  It is really an absurd idea: one does not hate if one is at all wise since hate only harms the hater and needs therefore to be eliminated if one is to be full and happy.  Therefore no matter how absurd or even harmful a teaching may be, one does not mock.

Still, when you look objectively at the things religions have done and still do to people, it is an emotion one can understand, especially in those who have had to deal with religious belief in family members and so on, or who have discovered the indoctrination that happened to them that they have to live with the rest of their lives.