You realise that by eliminating Romans as a western civilisation, you just removed the sine qua non of all western thought and institutions?
If you didn't select Roman part of my paragraph and exclude Islamic contribution I mentioned, you wouldn't end up this conclusion. I bet you will accept ancient Greek civilization as "sine qua non" part of your perception of romantic western civilization. You can do that, it is your understanding of history. However, if you go that far, you must necessarily include Islamic tradition inside of your Western Civilization. They share geography, stories, and blood...
Much as I would like to, I have to regretfully decline this elimination. The Roman civlisation was a western one.
As I said, it's optional. But I wouldn't call a slave labour based agricultural socio-economic land based system as western civilization, just because they occupied the same geography with one part of Western Civilization (Europe part).
Uh you can't arbitrarily decide these things.
Not really, my criteria is the end of dominant world view (Christianity based agricultural culture), new geographical discoveries, Renaissance and resulting substantial developments in arts, science, politics, society, military and secular world view. End of 10 000 year old agricultural socio-economic system. And all these things first started around the dates I mentioned. I wonder what is your criteria for western civilization. I hope it's not "going to church and eating pork".
Then you should have no problem finding ONE invasion in 1400 years justified by the other being an infidel.
Not at all, because infidels are the general names of anybody or regime who was not Muslim. Sometimes dominant Muslim (Sunni) regime declared other Muslims (Shia) as infidels too. And don't confuse legitimizing (making things normal in people's minds) with official war declarations of Islamic Administrations.
But if you are after legitimising Islamic wars among other examples in human history, or trying to show them how rightful and honorable people those Islamic warriors -and their intentions- were, I will not join this game...