Summary - In what ways is Islam a way of life as well as a set of beliefs?

Islam regulates, apart from beliefs, also everyday life and customs. For example, it restricts what you can eat (halal) and effectively ensures that you will most likely eat with fellow Muslims (you're unlikely to eat non-halal food with non-believers).

It also regulates your day, requiring you to pray five times a day - this has a big influence on people's everyday life.