There are some great resources for combatting "Bad Theology" available at Monergism.com
Monergism is a first class theological website that you should bookmark asap and frequent often. Click on the title of this post for the link to "Bad Theology".
There is a very helpful five page pdf. file at the top of that page by Phil Johnson of Pyromaniacs on "The History of Heresy: Five Errors that Refuse to Die".