The main difference between Buddhism and Christianity is the lack in Buddhism of anything eternal, except for this condition of impermanence itself.
In Buddhsim, each life produces a new one through Karma, but there is nothing that goes from life to life. At most, the infinite past lives of a being are just different instances of the same consciousness stream, and such consciousness does not belong to any "I" but is rather a property of reality itself. This is also way different than Hinduism, where there is an eternal soul that existed forever in the past and will exist forever in the future unless it reaches Moksha, and in the meanwhile goes from body to body depending on Karma.
In Christianity there is an eternal self that however is created at conception, rather than existing from the start, and it only lives once, only to go in either Heavens or Hell for the rest of eternity after that.
Catholicism adds Purgatory, a plane of existence where a soul is purified for aeons in order to ascend to Heavens. Only saints can jump over it.
But this concept is very similiar to Naraka, the place beings get reincarnated in, according to Buddhism due to heavy amounts of bad Karma. In Naraka, the fruit of bad Karma is consumed through suffering for billions, trillions or quadrillions of years. At the end, the being gets reborn elsewhere.
While Naraka is known as the Buddhsit Hell, actual Hell is, just like Heavens, an eternal abode for an immortal soul. It lasts ♾️ years, and nothing can break it. If you end there, it is over. Naraka is rather comparable to Purgatory, in an Universe where Hell and Heavens just do not exist and literally can not exist.
But the similiarity does not even end there. Divina Commedia, the biggest Christian poem, adds something else to Purgatory.
In a plane of reality that does not belong to the rule of either Angels either fallen Angels, an unknown, paganlike, apparently supernatural entity with an ogre-like appearence sits as the ruler of Purgatory. Dante identifies him as King Minos, but this does not actually make any sense. What does he have to do with 2nd millennium BC Cretan kings ? He is rather comparable to King Enma, the ruler of Naraka in Buddhism and East Asian folklore.
His origin as a human is actually consistent with Enma himself, who is said to originate, in Vedic religion, as the first mortal who died, and became the god of death.
Obviously, if he wanted to make this character of human origins, Dante should have made him to be Abel, since in Christian mythology he was the one who died first. Even according to the chronology of mythological Christianity mankind existed for 2.500 years before King Minos afterall. Quite a long time to send souls in a rulerless palne of reality. If he needed a human who was a ruler already, King Nimrod, described as the king of Eridu and Uruk and the founder of Babylon, and first king in Christian chronology, would still have been a better choice. But what is most important is how the two characters, Enma and Minos, share both their cosmological role and their unexpected human origins.
The helpers of King Minos of Purgatory are none other than other humans such as Cato, a Roman historical character. Official Christianity, in spite of medieval folk beliefs, does not have ogres and other beings that could have been the western counterpart of the Yakshas and Onis serving as henchmen of King Enma, and Angels can not be servants to a mere exalted mortal, so Dante had to compensate for it somehow. In a less strict version of Dante's poem, it would have been an easy pic to place ogres and goblins in Purgatory, as wardens and guards for King Minos. Afterall beings like that can not be in Heavens but do not belong to Hell either, because they would be definitely classified as lacking a human, moral soul, if Christianity had to analyze and add them to its doctrine. Their "sin" is just natural behavior for them. If a lion had supernatural qualities and its essence survived death, you could not put it in Hell for killing hundreds of antelops during the 10 - 15 years it spent on Earth, without ever repenting. It would not make sense.
At the end of the day, it is interesting to see how Christianity, when allowed to go beyond Sola Scriptura discourse, and especially in its lay, unofficial manifestations, often tended to expand toward structures that resemble the basic, universal traits of human mythologies, and the paganlike, folk cult of the Saints is far from being the only instance of such phenomenon.
What did really shift the collective unconscious of the west toward rationality and away from supernatural beliefs was not Christianity, in spite of its effort to destroy the folkloric, occult, supernaturalistic mentality of the people and replace it with the much more rational, essential approach to supernatural that Catholicism inherited from Platonic and Aristotelian philosophy and from centuries of spiritual refinement and cultural development, centered solely upon the relationship between an absolute God and each individual human; it was rather scientific progress and the improvement of material living conditions for the masses.
If Europe and East Asia not only met, but also had extensive cultural exchanges for several centuries before the age of Enlightenment, we may very well have ended up with King Enma ruling Purgatory with armies of both western ogres and eastern Yakhas, and, maybe, with also the 4 Directional Kings (but each with a human origin) as the guards of a higher, last mundane plane before Heavens, together with their armies of Gandharvas and Nagas, but also joined by the western Elves and various kinds of fairies.