There is no such thing as "radical" islam. They are ALL radicals, just some are more overt about it than others. Some take up arms, others just fund, and still others simply sit back and don't do anything to stop the others.

Radical muslims are just plain muslims. they are all the same. Some act nice to your face, but as soon as you turn, they are planning ways to kill your family or more soldiers if you don't convert. Sad, but true.

More reality, some simply recite what they are told to from the quran. Thay have no idea what it actually means, only that they are required to say it. They blindly follow and bitterly fight anyone who opposes them.