It varied based on region and time. By the end of the Middle Ages, most of Europe was monotheistic either through Islam or Christianity. At the onset of the Dark Ages, however many polytheistic (or pagan as they were derisively known) religions persisted, particularly in parts of Europe which were not incorporated in the Roman Empire (ie: Germany, Scandinavia, etc.)
There were 7 medival gods
They believe in many gods.
There were many different languages in medieval Europe, as there are today, and many different words for "hospital."
They have many, many gods.
As with any country with so many religions it depends on the person you ask. Many people believe in many gods, many believe in none and many believe in the Western Gods.
people that believe in many gods
one
One
yes
2
2
lot