It is a world wide religion, which originated in the Middle East under Roman Rule,
It became a world wide religion as part of Western Colonization.
Jesus were a Jew, thus semite, and he did not have any descendants as far as I know.
His flock were Jews and they have traditionally been keeping to themselves,
so while there maybe odd cases where Arabs marry Jews, or Jews converting my feelings
are that this is not common, but have no facts to substantiate that feeling.
That is why I said "often", the whole of North Africa, Spain, Balkans, Iran, Indus Valley were conquered.
In current days, Islamists are violently trying to convert, but that may be just a pretense
to give some legality to naked blood lust.
If Arab Muslims just "reestablished old status", what are they doing in the Middle of France?
What are they doing in Anatolia?
As I pointed out, the basic laws at the time of the Crusades, was "might is right".
The Franks were not responsible for Roman Conquests, yet they were attacked, by Muslim agressors.
Muslims got the response in the form of the Crusades.
The original conquest of regions of the Byzantine Empire by Muslims, were as legal/illegal
as the Roman conquests of the same regions.
What you said about Christianity, which is not a Western religion but a Semitic or as it is also called, Abrahamic, religion, also apply to Islam. Other than in fact Christianity being spread through conquest on a much larger scale and much more recently due to Western European colonialism of the "New World", mainly Sub-Saharan Africa and the Two Americas but also Oceania.
My initial focus was the Near East and in particular areas inhabited by Arabs (who happened to be non-Muslims before Prophet Muhammad (saws)) or other Semites whose lands were controlled by local rulers/governors loyal to non-natives (successive emperors of Byzantine/Rome - a few that happened to be Arabs themselves and more that happened to originate from the Arab world) ruling from Rome/Constantinople/today Istanbul.
Nobody denies that the first people who converted to Christianity were Jews or that Prophet Isa (AS)/Jesus was a Jew. The point here is that most Jews rejected Jesus hence why 99% remained followers of Judaism. In return neighboring Arabs were the first non-Jewish people who came to contact with early Christianity. In fact I predict that some of his earliest followers while he lived were Arabs given the fact that Palestine/Israel back then was mixed and Arabs had a significant presence too as explained before in detail.
For instance King Herod the Great that lived almost 100 years before Prophet Isa (as) was born, was an half Arab (Nabatean).
https://en.wikipedia.org/wiki/Herod_the_Great
Many of the Biblical areas described in the Bible took place in Arab-inhabited areas such as areas East of the Jordan river, South of it and Sinai. Southern Syria as well.
Yes, which I called payback for Roman/Persian occupation. Nothing wrong with that.
Balkans happened 1000 years later during the Ottomans.
That we agree with but you cannot say that "Muslims" were the aggressors here as the people who became Muslims, their ancestors lands, were attacked first by powers from Europe and not the other way around. Why? Because back then Europe had very little to offer. In fact nothing that the earliest civilizations of the Near East did not have therefore it made no sense for say Sumerians to conquer or even become interested in say modern-day Austria.
The only ancient civilization that I can think of that colonized much of Europe/founded many cities, influenced history a lot, were the Semitic Phoenicians that were based in modern-day Lebanon mostly, and which according to most theories, like most Semites, originated from the Arabian Peninsula before their settlement of nearby Northern Sham.
See page 269 and afterwards in this book:
The Phoenician empire 1500 BC to 539 BC:
Map of Phoenicia and its Mediterranean trade routes
https://en.wikipedia.org/wiki/Phoenicia
But have in mind that Greeks had a similar presence in North Africa, Levant (Sham in Arabic), Northern Arabia, Anatolia, Iran etc. before the Roman Empire emerged but obviously not before Phoenicia.
Other than that I cannot think of anything else but in fact you might as well say that most Europeans descend from people that once lived in the Arab world (Neolithic peoples). Those same peoples spread farming to Europe for instance. And before that we can talk about all of us originating from the Arabian Peninsula (non-Sub-Saharan Africans that is) and before that all of us being originally from Eastern Africa where humanity supposedly originates from.
Also don't forget more recent European colonial history in the Arab world/Middle East/almost the entire Muslim world.
Almost the entire planet was at one point either colonized, influenced or under the sphere of Western European colonial influence.
So if you want to discuss about who spread their religion the widest/who converted most people etc. Christians and Western Europeans will win, but mostly due to the past few centuries dominance, starting with the Renaissance.
Before that era occurred I do admit that Arabs were the biggest imperialists to date. Outside of the very short-lived and not that influential (in comparison) Mongol Empire that got founded almost 600 years later. Before that you had other peoples who were dominating or had their heydays before their dismiss as world powers. A natural process.
However the thing here that annoys me is the ignorance and prevalent/predictive views among many Europeans that somehow history began 2100 years ago when Romans ventured into the Near East. That's not the case. So I will of course object to such a notion.
I am sure that you could find somewhat similar analogies, not as old though, in regards to Sweden and its backyard.