Blessed are those who are persecuted for righteousness’ sake, For theirs is the kingdom of heaven. Blessed are you when they revile and persecute you, and say all kinds of evil against you falsely for My sake. Rejoice and be exceedingly glad, for great is your reward in heaven, for so they persecuted the prophets who were before you. Mat 5:10-12
But nothing has been said that Christians cannot defend themselves against those that revile and persecute them.
It is not expected of innocent Christians to meekly put their heads on the chopping block.
If that were true, Charles Martel and others who fought Islam would be condemned for their actions.