Antisemitism is a big word that means some people don’t like Jews, who are people who follow the Jewish religion. Christianity is another religion that some people follow, and in history, some Christians did not like Jews for different reasons.
Long time ago, when Jesus was alive, he was a Jew himself, and most of his friends and followers were also Jews. However, some Jewish leaders did not like him, and they helped the Romans to kill him. This made some Christians blame Jews for the death of Jesus, even though it was a long time ago.
Another reason why some Christians were antisemitic is that they believed Jews killed Christian babies and poisoned wells. These were just rumors and lies that caused a lot of problems for Jews, who were often blamed and mistreated. Sometimes, Christians would force Jews to leave their homes or even kill them, which was very wrong.
Over time, many Christian leaders and churches learned that it was not right to blame Jews for everything. They started promoting love and respect for all people, including Jews. Today, most Christians and Jews get along well and work together to make the world a better place.
In summary, antisemitism in Christianity means some Christians did not like Jews and blamed them for different things. However, many Christians have learned to love and respect Jews, and today, they work together to make the world a better place.