Normally I always heard that the crisis of paganism (and polytheism) in the Roman Empire was generated by a sense of growing insatisfaction of various social strates towards the traditional religions, which allowed new ones (Christianity, but also Mithraism, and Zoroastrianism) to fill this lost gap. But I feel this explanation wouldn't be sufficient, like I missing something or not fully understand. After all this crisis started in a moment of relative peace and prosperity in the Mediterranean basin and in the Middle East, ruled by the Romans and the Sassanids. How could this historical conjuncture, where humans lived their highest level of civilization so far, provoking such a cultural crisis on the other side?
I can eventually think some of the causes were the philosophical development turned towards a more doubtful inclination of the certainties so far, the issue of slavery in the Empire, and other, but then I am thinking of previous empires respect to Rome where despite living such high standards didn't have decisive religious crisis, starting from Egypt. Sure, there was the Atonian parenthesis, but it was short and contained and Egyptian cults resisted till Hellenistic age and more, when Egypt as ruled by a local dynasty was gone by a long time; and probably could have lasted more, if the knowledge of hieroglyphs wouldn't have been lost. Or China, where Buddhism penetrated only after 8th century and even so coexisted with local religions and in the same India, the rise of Buddhism didn't eradicate Hinduism but rather allowed a dual coexistance.
More than Persia in itself, where Zoroastrianism essentially synchronized with Mazdaism, the most similar case to Rome where a deep religious crisis happened is the Middle East, where the Mesopotamian and Anatolian cults felt at a certain point in disgrace and decline, in this case by Hellenist influence, where the assimilation was much stronger and I am guessing the progressive abandon of cuneiform contributed on this.
Summarizing, what did have the Roman Empire to face such a religious crisis which other Imperial states of the time didn't have?
I can eventually think some of the causes were the philosophical development turned towards a more doubtful inclination of the certainties so far, the issue of slavery in the Empire, and other, but then I am thinking of previous empires respect to Rome where despite living such high standards didn't have decisive religious crisis, starting from Egypt. Sure, there was the Atonian parenthesis, but it was short and contained and Egyptian cults resisted till Hellenistic age and more, when Egypt as ruled by a local dynasty was gone by a long time; and probably could have lasted more, if the knowledge of hieroglyphs wouldn't have been lost. Or China, where Buddhism penetrated only after 8th century and even so coexisted with local religions and in the same India, the rise of Buddhism didn't eradicate Hinduism but rather allowed a dual coexistance.
More than Persia in itself, where Zoroastrianism essentially synchronized with Mazdaism, the most similar case to Rome where a deep religious crisis happened is the Middle East, where the Mesopotamian and Anatolian cults felt at a certain point in disgrace and decline, in this case by Hellenist influence, where the assimilation was much stronger and I am guessing the progressive abandon of cuneiform contributed on this.
Summarizing, what did have the Roman Empire to face such a religious crisis which other Imperial states of the time didn't have?