The five pillars of Islam are the basic rules by which Muslims live, they are;
The Declaration of Faith (Shahada): " There is no God but God and Muhammad is God's Prophet."
Prayer five times a day(Salah)
Payment of the poor tax(Zakat)
Keeping the fast during Ramadan(Swam)
Going on Pilgrimage to Mecca and Medina.(Hajj)
because they are rules on how muslims should live thier life.
The Muslims rule for food are (halal & haram)
Muslims can worship in any country, there are no rules about this.
Islamic rules are called Sharieh. The main sources of Islamic Jurisprudence are: 1. The holy Qur'an 2. The Sunna 3. Ijmaa 4. Qiyas 5. Ijtihad
Muslims can conflict with each other, yes. However, it is not a good thing and it is frowned upon. And rightly so, for Muslims are brothers and should not fight. However, in some cases it is inevitable, but even then the Muslims have rules of conduct to deal with each other. They have rules of conduct with non-muslims as well.
no, they are guided by it, it is called the Quran they worship god like Christians but Islam (Muslims religion) has different rules. But Muslims call god Allah which is in Arabic.
They are those who just Muslims by name but they follow neither Quran rules and commands nor prophet Muhammad (PBUH) teachings.
The Muslims have to follow the rules of the Qur'an and the five pillars were taken out of it and are metaphoricly (they aren't really pillars) used as rules. Muslims must follow the Qur'an.
Never Muslims neither tend nor required per religion to irritate non Muslims. Refer to the related questions listed below for more information on the Golden rules of Quran (the Muslim holy book) and how Muslims treat non Muslims.
there is only two rules in a Muslim live... do what Allah like and leave what Him doesn't! easy right?
Yes. Only Muslims are permitted within the city.
It's probably a cultural thing.