This is just plain bullshit! The introduction of islam to much of the world was through trade, just the same as the christians. And if you take slavery, trade and military occupations to be evidence that "The real lesson is that some religions are actually militant political movements wrapped up in religion." then I am afraid you will have to say the same of christianity.
Once again, the point is that extremists / militants use religion (or any other reason) to justify occupation, oppression and murder. To fight militant-ism you have to do just two things. 1.resist. 2.not become one.
ps: were you serious about that video you linked? seems like dumb paranoid aryan propaganda to me..