Matthew 16 : 18-19 ; “And I tell you that are Peter, and on this rock I will build my Church, and the gates of Hades will not overcome it. I will give you the keys of the kingdom of heaven ; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven. “
True to it, despite early lethal persecutions of disciples and apostles and, not to mention recent history of attempted persecution of Pope John Paul 11, who was shot but survived on 13 May 1981. The Christianity has grown with reaps and bounds to about 2 billions followers.