the most populated city in Europe currently is Moscow with a population over 10 million
The European Union actually has a large population of people who aren't affiliated with religion, almost half. More and more Europeans are becoming non-religious. However, going into citizens of the EU who are actually religious, all EU countries are majority Christian. The largest religious denomination of the EU is Roman Catholicism.
Located east of the Atlantic Ocean
1)They all have ratified the Lisbon Treaty which is the newest treaty that defines EU's common institutions - the European Parliament (legislative power), the European Commission (Executive power), the Court of Justice of the EU (judiciary power), European Central Bank, Council of Ministers and the European Council.
2) They share a single market, ensuring the free flow of capital, goods, services and people. 17 of them share a single currency - the euro. More member countries are expected to join the Eurozone as soon as they fulfill the Maastricht criteria (budget deficit, external debt, inflation and other limits).
2) 25 of them (except the newest 2 members, but that will change) according to Schengen Agreement have abolished border controls in between the member countries.
Germany