I have no idea why an atheist would object, to be honest.
As an Atheist, I can see no reason not to have such a course. One of the problems that I see with the world today is lack of knowledge of other views. Hitting what is real and why a particular group believes in whatever can only strengthen their own beliefs & ideals. If one objects to bringing out the views of others, then they must not have much faith in their own beliefs.
There is no better love between 2 people than mutual respect for each other WT Young, 2002
Who gave anyone the authority to call me an authority on anything. WT Young, 1969
Since Evolution is only ~90% correct it should be thrown out and replaced by Creation which has even a lower % of correctness. W T Young, 2008