Look at pre-Enlightenment Christianity, when there was no separation between church and state. It could be described as a "militant religion." That Islamic culture is behind us in its historical development would not necessarily mean that the core of the Islamic faith is violent and radical. That is the point I intend to make, not that Islam itself is a true religion.
Yeah, there was the Byzantine empire, and the growing state of the Russian Tsar; however, you cannot equate these things that occured in Orthodox history to the caliphate and implementation of Shari'a in the 'ummah. These things in Orthodox history, at least in my opinion, are not a part of the faith itself, nor of the ultimate doctrinal/canonical Tradition. Sure, the Emperors of Byzantium did indeed influence some formation of liturgy, and to this day we can see in many Greek Orthodox churches the double-headed eagle of Byzantium. However, these are merely occurances and not static incidents - and to take them in the same political context as Islam (which is intrinsically theocratic, right down to its very doctrine) would be wrong.
Perhaps if youre referring to the caesero-papism of the Roman Catholic Church, in relation to Islam, then yeah you got a definite link there. However, monarchy is not inherrent in Orthodoxy - whatever IS inherrent in Orthodoxy, as far as political alliances are concerned, is definitely a moot point. But, the point remains that this "state and church" union we saw in Byzantium and Russia cannot be equated with Islam's need for a international dominance of Shari'a (or just simply Islam).
As far as militancy is concerned, there are examples of this in the Byzantine state and church union (handling of Jews, monophysites). Then again, we have to assess whether these examples are reflective of "render unto Caeser what is Caeser's" vs. a Caeserization of Byzantine Orthodox mindset.
If I'm not making myself clear, main point is just: Islam = theocracy and the doctrinal origin of this theocratic mindset Ã¢â€°Â the Christian Emperors and their doctrinal origin. Thus, Islam sucks.