Welsh and English are the two main languages spoken in Wales.
Most northern European people speak languages belonging to the Germanic language group, such as German, English, Swedish, Danish, and Dutch. These languages are also spoken in other parts of Europe and beyond.
Europe has many countries, with many different languages like, French, German, Dutch, English, Swedish, Spanish, Italian, Greek, Irish, Portuguese, Norwegian, Romanian and many, many others. So depending on what part of Europe you are, in will depend on what types of languages you will hear and how people will speak.
People who speak two languages are commonly referred to as bilingual.
People who speak several different languages are called polyglots.
Most of Europe can speak in English but it is not their primary language. If you lived in the United States you would speak your birth language of English not Spanish or French or any of the Native American languages or other languages that exist in that nation. Germans speak German in Germany. French speak French in France. They can speak in English too because English speaking people do business with them and the tourists do too. In the US they do not get very many German or French people visiting so they don't learn those languages but they do learn Spanish since there are millions there who speak in Spanish.
Romance languages are primarily spoken in Europe and Latin America. Countries such as Spain, France, Italy, Portugal, and Romania are where these languages originated and are widely spoken.
Most Arab Muslims speak dialects of Arabic. Notable exceptions are those that have immigrated to Europe or the Americas.
Most people speak one or two languages fluently. Some people may speak three or more languages, but that is not the norm for the average person.
French and German are both official languages in Switzerland (along with Italian), Belgium (along with Dutch) and Luxembourg (along with Luxembourgish). But in most countries in Western Europe, or the world for that matter, there are people who speak French and people who speak German (either in a large population or small).
The Bantu people don't speak religion. Furthermore, Bantu is a group of languages, not an ethnic group. People who speak Bantu languages practice many different religions.
Slavic people speak Slavic languages. Some of the most common are:RussianPolishCzechSlovakBulgarianUkrainianBelarussianRusynSlovenianBosnianCroatianMontenegrinMacedonianChurch SlavonicFurthermore, some Slavic people speak non-Slavic languages as well, particularly:EnglishGermanRomanianHungarianFrench