Both are totalitarians.
One group is totalitarian in its concept of how to worship God.
The other group is totalitarian in their demand social justice (of a type that they imagine), tolerance (of the issues they demand you tolerate, but not what they want to do), care for the environment (but not based on science, but rather the concept humanity is bad, nature good, let's all worship Gaia), interntionalism (evil is being a patriot.)
They haven't as a whole taken to bombs yet, but the Totalitarians for Social Justice And Whatever Makes George Bush and America Look Bad are IMHO not far from it. There's already Earth Liberation Force out there.
Same mentality as the terrorists - all or nothing.
I completely agree. Like Ann Coulter says, liberalism is a religion, and much like Islam is, it is a totalitarian religion. Although I would say liberalism is worse than Islam. Islam just has it`s Sharia law, but liberalism on the other hand seems to embrace every sick social/governing/belief system that ever was. If it damages, oppresses, enslaves, they want it.