Religion plays a big role in how people in Europe feel about the EU, especially in the UK's Brexit vote. This study looks at how religion has influenced support for the EU since the UK joined, leading up to the Brexit referendum in 2016. It also shows how religion still affects opinions on the EU after Brexit. The research helps explain why the UK voted to leave the EU and how religion shapes how people in Europe see the benefits and drawbacks of EU membership. This study is important for anyone interested in religion, European politics, and understanding Brexit.