I was in a language class with Muslims from Iraq, Iran, Kurds from Northern Iraq, Somalians, Bosnians, Kosovoans (spelling?), and Pakistans.
It was a wonderful class: we had a great time. But, one thing I noticed is that the Muslims from different countries had such different interpretations of the Koran. When a woman from Somalia said that female circumcision is required by Islam, there were furious protests from all the other Muslims.
The Bosnians and Kosova Muslims criticized the idea that a man can have more than one wife saying it was backward and they (and their wives) were too educated to practice that tradition.
Basically, there was a lot of disagreement about the doctines of Islam.
I'm a Roman Catholic, and the leadership for Catholics all over the world is centralized in the Vatican under the leadership of the Pope and the Cardinal Bishops. There are also ecumenical councils periodically that discuss and determine changes and in doctrines.
Is there a centralized leadership for the Muslims of the world?
Moira
.In Islam, we have rules that all Muslims follow.
We take our judgments and teachings from Qur'an, sayings of prophet peace be upon him, Ijma^, and kiyas....
These are the bases that we use, we sure follow the scholars in what they say, but the scholars followed what I mentioned above to write and teach about Islam.
So, when someone say a judgment concerning our religion, we don't look who's this guy, or who's his father, or where he came from, we see if what he's saying doesn't contradict our rules, we see if it's based on the right proofs, then we say if he' right or wrong.
Let's take for example what has happened in your class....Having more than one wife is something that the Qur'an mentioned, and the prophet told about, and all the scholars said that this is lawful in Islam under certain rules, so the one who criticize having more than wife is not following the Islamic judgment, so his disagreement does not mean anything, as long as Allah made that thing lawful, the slave is not allowed to disagree.
Maybe the reason why you see many different ideas talking about Islam is because ignorance... Many people did not learn properly, then they come and say this is right in Islam, this is wrong in Islam, without any evidence .