Not everyone who grows up in a Muslim culture ends up a fanatical Muslim.
I grew up in the Middle East and there are few people as opposed to Islamic expansion as I am.
But then, I wasn’t raised a Muslim. Maybe that’s the difference. Of course, with the various views on Christianity, it’s possible a similar phenomenon has developed within Islam. Still, the theory is not enough to make me trust ANY of what is going on.
In other words, people with their own cultural and political aims co-opted the message of Jesus Christ, and used it to control other folks.
For the most part, that unfortunate era of Christian expansion pretty much ended, and today's evangelical movements are largely peaceful. This, in my opinion, shows the maturity and civilized nature of Christianity -- it mostly stopped being the excuse for people to subjugate other people.
Unfortunately, Islam is still at the stage of its inception in 600AD or so. It is still barbarian, rough, uncivilized, immature.
Again in my opinion, this is because true Christianity never espoused the violence that was committed in its name. Christ was a man of peace, not war. In returning to real Christianity, Christians found a message of peace.
Islam, on the other hand, espouses violence and demands that it be committed in its name. And Mohammed was a man of war, not peace. The message of Islam is not a message of peace, despite protestations to the contrary.
Caveat: I am not a student of Islam -- the above is not authoritative, just my opinion.