Question

In what ways did religion and economics influence the development of medieval Europe and Japan?

Answer 1

"Christianity and the feudal system in Europe and Shintoism/Buddism and a similar structure to the feudal system in Japan"
Now you have to turn this into a thesis.
So like:
Christianity and the feudal system in Europe and Shintoism/Buddism and a similar structure to the feudal system in Japan influence the development of medieval Europe and Japan.
I wouldn't do that though, it looks last minute.
So let's change the wording.
The ways religion and economics influence the development of medieval Europe and Japan was by Christianity and the feudal system in Europe, while Shintoism/Buddism and a similar structure to the feudal system in Japan.
It's rough but a start. I'd advise you to re-fix that thesis because I would never use it directly like that.