The Radical Islam has twisted the Holy Quran and the other Islamic sects by being selective in the quotation of certain verses about Muslims and Non-Muslims.
a radical Islamic leader who reinterpreted Islam to justify violence
Islamic fanatic politicians, mullahs and talb e ilm
The radical-fundamentalist Islamic followers are not at war with the West, they are at war with anybody that do not believe what they believe in. They have killed many more 'ordinary Islamic' followers then 'westerner' for not strictly following their interpretation of the Koran (the Islam Holy Book)
Islam is a religion that can be represented by Islamic Community, Islamic state, Islamic nation, or Islamic world.
Wahhabism is a radical form of Islam, founded by Mohammad Ibn Abdul Al-Wahhab in the 18th century, which claims that: any teachings added to Islam after the tenth century are false. It envisions an Islamic empire led by holy men, with no other law than strict puritan Islamic law. This is why they are referred to as 'Islamic fundamentalists'. It opposes the concept of nationalism and borders as being un-Islamic.
If you mean, where Islam is not practised in toto, in letter and spirit, then most of the Islamic countries are not following Islam.
Islam
No Islamic leader was forced to convert to Islam. It is a basic and explicit rule in Islam; per Quran; that no compulsion in religion.
Islam as a religion expanded as the Islamic Empires expanded through conquest and where Islamic merchants met with receptive cultures outside of the Islamic Empires.
Islamic Tourism means tourism of Islam
There are no Islamic moths. Maybe butterflies, but no moths.
Your question is an ideal one. before i answer it i would like to tell you, that as a Muslim i find it slightly offensive that people (not you in particular) immediately pair the word 'radical' with 'Islam'. i am a Muslim and i assure you not radical in any way. you must understand, Islam reinforces peace above all else, one of the most important events in our history was a treaty called the treaty of hudaybiyah, it was a PEACE treaty. anybody who insists on killing innocent people for no reason whatsoever can no longer be called Muslim because they have commited murder, and a Muslim does not murder. so your question of the 'principles' of radical Islam, does not exist. Islam is not radical and thus there is no such thing as a 'radical Islam' because then it wouldn't be Islam, it would be radical. make up your mind because it cant be both. so to answer your question, there is no radical Islam. -this answer is my opinion as a Muslim.