the desire to eliminate wealth and corruption from the church
The Catholic Church was the only church in the Middle Ages and the pope ruled the church and monarchies of Europe.
The Catholic Church
"Catholic." is what the original answerer said. There was never just one religion. After the Reformation, or protestant movement. Many religions, like Lutheranism, and Calvinism were started when people got fed up with the Catholic Church.
The Catholic church was the "state" and ruled the society of the middle ages.
There was one church and one religion in the middle ages and that was Catholic. So, any timeline would be of the Catholic Church.
The only church in the Middle Ages was the Catholic Church. I am not sure what the question is asking about the church.
A member of the Catholic church.
The Catholic church was the only church so any religious celebrations or services were Catholic.
the orthrodox church
There was no single view. See related link for an article on the Catholic Church in the Middle Ages.
The Roman catholic church during the middle ages in Europe can best be described as a church that was a stable influence. This was during a time where central governments were weaker.
I have read that about a third of the property in England was owned by the Church in the Middle Ages. It is hard to find a source for this, but the article on the Dissolution of the Monasteries (link below) says monastic lands were 16% of the country. Since there were many other lands belonging to the Church as well, a total of 33% might be believable.