Do you know all about the time when the Ancient Greeks and Romans lived? This time is called Antiquity. It lasted from 3000 BC to 500 AD.
Nowadays, almost every village has a church. Can you imagine the church was once forbidden? In the era of the Romans, you weren't allowed to be a Christian.
Do you know what a missionary is? These people are trying to convert you. In the period of the Middle Ages there were many missionaries in the Netherlands.