Professing Christians Warned, written by Pastor Gary Hendrix. This tract is available for free via download or in print (limited quantities) from Chapel Library. While this tract is longer than to what you may be accustomed (approx. 1,500 words), it is an excellent tract for distributing to potential false converts.
I plan to distribute this tract (and others) when I travel to Redding, CA, home of the "signs and wonders" cult, Bethel Church. I hope to be in the area sometime during March of 2014.