Heresy in Christianity

"In inter-Christian disputes, the name of the game is always to demonstrate that your own position is the truly Christian one while the opponent’s is “heretical”. But Christianity is very broad-based and admits of many more contradictory positions than Islam, for instance. Thus, you can find theological support for both pacifism and Holy War, for both social justice and obedience to authority, and so on. So in practice everyone is somebody else’s heretic on solid scriptural grounds. Whether you end up getting condemned as a heretic only depends on which doctrinal party is in power. ... It is precisely the apologist’s job to argue for the essential Christianity of what now counts as respectable and good, and to show the profound un-Christian nature of what now stands discredited or is held in contempt."