It is the planned use of propaganda and other psychological actions having the primary purpose of influencing the opinions, emotions, attitudes, and behavior of hostile foreign groups in such a way as to support the achievement of national objectives.
In the case for counter-evangelism, it is done by exposing the lies and misinformation that the evangelical movement produces. It is similar to subverting, although it will go into more details and more research is involved.
Also, in information warfare, more conventional mass media is used, such as letters to the editor, publications of websites detracting and exposing the truths about the evangelical movement or even radio stations (e.g "The infidel guy").