There are people, out of ignorance, that believe that Muslims are following arabic traditions and that islam on is a cultural thing. Nothing is more wrong than that.
Some people believe that if you are catholique and lives in Rome that you will find it normal to do some Christmas-stuff and that if you are a Muslim and lives in Tunisia you will find it normal to do certain stuff at Eid. And that it is the same thing: and that is the basic belief in every believing person.
There is a huge difference between believing Muslims, Muslims and non-Muslims.
Islam came to destroy all cultural things and remind people that they have to do scientifique researches and reflect upon and interrogate on e v e r y thing that is in life and the origine of it. For example: Why do we celebrate Christmas? And what is the origine of it? It is obligatory to every Muslim to ask about everything in Life, like kids do. And find answers to everything.
A Muslim never accept anything without knowing why. Everything has to be discussed and questioned and you never follow a culture nor tradition. What happens in Egypt or in Tunisia is culture - not islam.
Most people born into Islam don't follow Islam at all. They are ignorant and don't know even the basics of Islam. They believe that Islam and that the best of the Muslims are those that do their prayer, but in fact, the truth, is that the prayer is the basics of Islam and not the top of it.
Islam is about changing the way of thinking, feeling, understanding, behaving, your behavoirs and character. The best amonst the Muslims have a charactere and behaviors far from that of most of born Muslims today, and they are only Muslims, not believing Muslims, just like people celebrate Christmas, while being Atheists or Agnostics. It is a big difference between Muslims and Believing Muslims, that is why the world are confused.