Then I have to admit your original point has escaped me, because I know I wasn’t trying to be funny.
If the geography teacher claims that geography answers religious questions, such as the location of Heaven, then geography is a religion for him or her. The idea that Secular Humanism is a religion is not based on the fact that many of its adherents seek to convert other people to Secular Humanism; rather, it is considered a religion because of the fact that it provides answers to religious questions.
By that over-broad definition, physics and biology are religions as well.