The Klan is pretty much a tiny minute fraction of southern white Christians. Many still hold conservative views, but there is virtually no connection between churches and the Klan anymore. The Muslim world is a different story. The faction of radical jihadists is certainly a minority, however there is a great percentage of regular Muslims, mostly among the men, that agree not with terrorism, but the implementation of Islam everywhere.

Now I know many Christians would like to see their doctrine implemented across the world as well. What is the difference?

The difference is this: Sharia Law. Any proponent of basic human rights would fight against this fundamental Islamist code of ethics. It subjugates women, bans homosexuality, prohibits free speech, etc. It dictates all law from hygiene, the economy, diet, and dress code.

Now I don't see white conservative pastors and priests trying make women wear hijabs, limit free speech or influence the economy. Fact is radical Islam is much more dangerous than conservative Christianity.