Vandals.
Clovis
The name of the tribe or group of people that first spoke Germanic is not known.
The Germanic rulers adopted Latin Language, Roman Laws and Christianity.
They are a Germanic people who speak Flemish Dutch.
Genetically and culturally they are Germanic.
Christianity is a religion, not a language.
Herta Kollenz has written: 'Germanensitte und Glaubenswende' -- subject(s): Catholic Church, Christianity and other religions, Christianity and politics, Church history, Germanic, Germanic peoples, History, Religion
The Germanic people first worshiped gods of nature similar to the Norse pantheon. After the invasions by Rome, the Germanic people slowly converted to Christianity.
They speak Danish. Danish is a North Germanic language http://www.omniglot.com/writing/danish.htm
Christianity did not make the Roman Empire stronger. The Later Empire became weaker and its western part fell under the invasions by the Germanic peoples.
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.