Actually, what goes to the heart of culture differences is what the Ayatola Khomeini himself said after being welcomed back to Iran after his exile to France ended with him overthrowing the Shah of Iran. His own words. There is no radical Islam. There is only Islam. Read the Khoran and the Hadith yourself, or if you can't stomach millions of words of racism, misogyny and hatred for all others, do as Mr. Youseff suggests, watch some of those videos readily available on YouToube or the many Islamic based sites. I guarantee it will be a wake up call to many.
Coeurmaeghan in Twentynine Palms, CA