I’m sorry for the delay… I haven’t been able to post much the last day or so.
I am not sure exactly what you mean by “branch.” There are sects in Islam, slightly different organizational structure, in some cases some doctrinal differences. The vast majority of Muslims are “Sunni”, 85%, the second largest group is “Shi’a” which is a branch dating back to a dispute over succession. There have been other smaller sectarian splits, among the Shi’a for example but also other groups, but I have no idea how many. Compared to the rest of the Muslims, Shi’a and Sunni make up probably 98% of all the Muslims in the world.
There is no leader for all “branches” or sects or all Muslims. Some movements have their own leader–often sects creep up as a following to a certain charismatic personality. Shi’a Islam I think does have a hierarchy while Sunni Islam does not–there is no centralized leader of the religion, although it’s possible for the people to be united politically under a single leader, although he would still not have religious authority (i.e., ability to change anything in the religion.)
Official? Without an official leader how can there be an official statement? That being said, you will find that Muslims around the world unanimously condemn terrorism perpetrated in the name of Islam. Here is a great site with tons and tons and tons of articles written by Islamic scholars (in the Usa, Canada, Britain, the Middle East, etc!!) and leaders in the Muslim world absolutely condemning terrorist attacks.
muhajabah.com/otherscondemn.php In fact, you can just skim through the titles of the articles to see. You might not be familiar with the names of the scholars, but I assure you that these are prominent and well-respected figures among Muslims.
There is a tradition that every verse has an inward and outward meaning at least. The Qur’an itself says that some verses are literal and others are allegorical. The Qur’an is interpreted literally and metaphorically–most often, both. One interpretation alone is deficient–including literal.
Muslims believe, based on the Qur’an, that God sent prophets to mankind–and many prophet specifically to the Jews, and even Jesus. So Muslims believe that Islam is the logical conslusion of the Judeo-Christian tradition.
Terrorism and suicide bombing are both forbidden in Islam. It is condemned by Muslim leaders as you will see on the site I linked above:
muhajabah.com/otherscondemn.php
They do follow most of the 10 commandments (not the one about the Sabbath) althought not in that form. Most of them appear throughout the Qur’an and in the teachings of Muhammad. Here is an article which answers the question:
Do Muslims follow the 10 commandments?
Declare the testimony of faith in Islam, that there is no god except the One God worthy of worship, and that Muhammad is his messenger. To say this, with understanding and sincerity, makes a person a Muslim.
I hope this post was able to answer your questions. Because there were so many I tried to be brief, forgive me if I have caused any confusion.