Seriously, they are so ridiculous I can't see them working on anyone. Take this one:
http://www.chick.com/reading/tracts/0099/0099_01.aspIs anyone going to actually read this and decide they need to quit partying and become a fundie because if they don't Satan might poison their drink? Unless they know of a case of that actually happening it might not be too effective.
The same is true of the famous D&D one. Since anyone who has played D&D knows that whoever wrote that clearly has no clue what D&D is like at all, they'll just laugh and reject it as the trash that it is.
Since almost every one involves a strawman of some, I have no clue how anyone could be converted.