If you think Levantine Paganism and Islam are even remotely comparable, there is nothing I could say that you are capable of understanding.
Comparable? Not sure about that. It would take some digging to see if any of the old pagan cults in the Levant had any connection with the pre-Islamic Arab pagan religion (and thus some tenuous connection to Islam). Interesting question, though...
The usual relation if pagan religions & Islam was, ahh,
adversarial. "Convert of be killed" was the muslim response to pagans found in their power.
Anyway, how comparable they are is immaterial to the point. Your question was, "Which major religions disappeared off the face of the earth again?" If you read (and understand!) your history, you will learn that major religions have been wiped from the earth due to civilizational struggle.
If you think Levantine Paganism and Islam are even remotely comparable, there is nothing I could say that you are capable of understanding.
You forgot that Ireland wasn't conquered. It, like a lot of the other places mentioned, were the subject of missionary activity.
And the Zoroastrians seem to be doing just fine.
True, Ireland did not have to be conquered to lose its (pagan) religion. A case for missionary conversion can also be made for the Scots, Picts, Welsh, and Celtic Britons.
The Celts in Iberia and the rest of western Europe didn't have it so easy, however, after taking it in the face from the Carthaginians, Romans, and Germans.
All religions & their civilizations were subject to Christian missionary activity almost as soon as they were "discovered" by Christendom. The large body of determined men ready and willing to make short choppy motions with sharp objects that accompanied the missionaries was usually the deciding factor, however.
The Scandinavian lands were not conquered, true, though the German lands were. So, about 75% of adherents to Nordic paganism were converted by means of Carolingian conquest & 25% were converted soley by missionary activity.
As for the Aztecs, Incas, the other central & south American religions, Levantine pagans, and Egyptian pagans, conquest is indisputably the cause of their disappearance.
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Overly broad statements and rhetorical questions such as, "Which major religions disappeared off the face of the earth again?" only need one example to refute them.