This Sunday's reading from Matthew 14:13-21 tells the miracle of the loaves and fishes.
Now when Jesus heard this, he withdrew from there in a boat to a deserted place by himself. But when the crowds heard it, they followed him on foot from the towns. When he went ashore, he saw a great crowd; and he had compassion for them and cured their sick. When it was evening, the disciples came to him and said, ‘This is a deserted place, and the hour is now late; send the crowds away so that they may go into the villages and buy food for themselves.’ Jesus said to them, ‘They need not go away; you give them something to eat.’ They replied, ‘We have nothing here but five loaves and two fish.’ And he said, ‘Bring them here to me.’ Then he ordered the crowds to sit down on the grass. Taking the five loaves and the two fish, he looked up to heaven, and blessed and broke the loaves, and gave them to the disciples, and the disciples gave them to the crowds. And all ate and were filled; and they took up what was left over of the broken pieces, twelve baskets full. And those who ate were about five thousand men, besides women and children.
A remarkable miracle retold in all four Gospels. I have heard a lot of revisionist preachers challenge the feeding of the thousands saying things like, "Oh, the people probably had food stashed away and brought out the leftovers at the end to put in the baskets" and other such attempts to explain away the miracle. I believe that those preaching the Gospel back in the early days went unchallenged because there were thousands of witnesses to back them up! So the story stuck.
For a person who professes to be a Christian to deny that God can produce any miracle sounds decidedly unchristian to me.