How did the goals of the crusades change

read this and make comments in several paragraphs separately and check if the answer answers fully the questions, if any thing that is missing. don't want grammatically to be corrected just see if it answers the question missing anything and so.........

The Crusades are probably the greatest symbol of the religious enthusiasm of the age. What were the goals of the Crusades? What motivated people to go on a crusade besides religious zeal? How do we account for the Crusades' general failure? What lasting impact do they have?

The goal of the Crusades was basically to restore Christianity in Eastern lands and return the political rule to the Byzantine Emperor. The first crusade was shot in the dark with no real prediction of what would happen. The Byzantine Empire was lost to Christianity and when the Turks began to put pressure on them they asked the Pope Urban II for help. The pope agreed but took careful opportunity to use the useless-feuding nobility to head the crusade, helping the Byzantine Empire and benefiting himself in the process.

The appeal of a crusade was the promise for new land and the gain of money due to foreign war. These people were influenced by hot blood and greed and the chance to see the Holy land. There was declining opportunity in West and when the call for the crusades came through many that were struggling took it as a god sent and signed up. The thought was that foreign war would mean money and with winning war came new lands to be owned.

The failure of the crusades was due in part to the fact that none of them achieved their goal of religious and political restructure. The Holy land once again was Muslim and stronger than ever. They were however economically successful creating trade between the west and the east. The trade routes were the most important lasting impact since it began to stimulate a global economy and opened up trade routes that were once shut down by the Islamic reign. Then there is the epicenter of trade Constantinople. The fourth crusade is to thank for that, however, for the 57 years that Roman's were in power in Constantinople there were not religious and political change that that crusades initially intended.