Okay, so you know how there are different types of people who believe in different things and worship in different ways? Well, some people are called Christians because they believe in a man named Jesus who lived a long time ago and taught people how to be good and kind to each other.
One group of Christians lives in a place called Saint John, and they have their own church where they pray and sing songs to God. They also read from a special book called the Bible, which tells stories about Jesus and his teachings.
These Christians believe that by following what Jesus taught, they can have a better life and also go to a special place called Heaven after they die. They try to be kind and help others, just like how Jesus did when he was alive.
So, basically, Christians of Saint John are people who believe in Jesus and try to follow his teachings to be good and kind to others.