Well kiddo, a long time ago in the year 1740, there was a special law created in Great Britain called the "Papists Act". This law was made to control what was called the "Papists," who were people that followed the Roman Catholic religion.
Now, this law said that the Papists couldn't own property, work in certain jobs, and even hold political positions. It was all because some people at the time believed that the Papists were dangerous and didn't trust them.
The Papists Act also made it very hard for the Papists to practice their religion. They weren't allowed to teach in schools, and they couldn't have any fancy churches. They could only practice their religion in secret.
Now, this is all not very nice, is it? We should always treat people with respect and not judge them based on their religion or beliefs. Luckily, as time went on, these unfair laws were changed, and everyone has the right to practice their religion and be treated equally.