He helped Europeans realize they share the same traits with different religions, such as the religions you listed.
Charlemagne was also interested in renewing the idea of the Holy Roman Empire, which basically made Christians and Germans come together.
The characteristic of the economic theory of mercantilism is that, exports should be encouraged over imports. The economic theory of mercantilism's main aim is to establish a powerful and wealthy state. Mercantile system is a kind of economic system that seeks to enrich a country be prioritizing and encouraging exports over imports.
Because both wanted power over North America and also they wanted land.