Here are some interesting areas to look into:
John-Gabriel Bodard's Bibliography for his class on Greek and Roman Religion has a wonderful list of suggested paper topics for his class.
The Bull Cult in Crete and Minoan Crete is fascinating.
Maybe the study of the Bacchae has spawned some interest in the cult of Dionysus. Check out a list of ideas all spawned by Dionysus.
Mob mentality in cults: Look for Gustave le Bon
Pagan Religion and Christianity; a great article by Larry Murphy
Hero worship and Saints
Check out Walter Burkert in Greek Religion, (published by Basil Blackwell and Harvard University press, 1985)
"A hero cult involves setting apart one particular grave, known as hero on, from other burials by marking off a special precinct, by bringing sacrifices and votive gifts, and occasionally by building a special grave monument."(p.203) "The hero cult has often been compared to the Christian cult of saints; and without doubt there is direct continuity as well as a structural parallel here. The heroes, however, are not required to live saintly lives." (p.207)
Carol Bateson of USC suggested this...
So Many Ideas, So Little Time
Books can and Have been written about anyone of these topics...have any suggestions of your own? Let me know