system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why did religions like Norse, Greek, and Egyptian die out but religions of Jewish decent (Jewish, Christian, Islamic) thrived?
gpt
The basic answer here is that Christianity and Islam became the official religions of empires that ended up conquering most of Europe and the Middle East.  And, since they were monotheistic religions, they tended to replace rather than exist alongside the local religions in those places. 

Judaism is the odd man out since it survived less as a result of its own conquests, but because it is in a sense a prequel to Christianity and Islam, and so ended up being more like a "sect" of those two faiths in terms of how it was treated, rather than being absorbed or displaced.  

There are, of course, other more specific factors as well, like the nature of the faiths, their own resistance to being co-opted, the displaced faiths being tied into political or social structures that were also outlawed, and particularities of history and culture.