the archbishop of canterbury yesterday called on christians to use non-violent means of resistance when faced with extremists - days after an attack in kenya killed 150 people .
in the wake of the slaughter of christian students in kenya and the barbarity of islamic state militants , the most reverend justin welby said the dead were ` martyrs ' .
delivering his easter sermon in canterbury cathedral , he said .
` christians must resist without violence the persecution they suffer and support persecuted communities , with love and goodness and generosity .