A unrealistic but possible POD would be that Trajan lives and continues his conquest of Parthia , securing Mesopotamia, Armenia, Azerbaijan and parts of Media leading to the collapse of the Parthians. Later on the Kushan Empire spreads Buddhism along the Caspian Sea and Iran , Eventually reaching the borders of Rome. From Mesopotamia , the number of Buddhists in the empire increases rapidly probably resulting in persecutions and such since Buddhism was staunchly against animal sacrifice. The Persecutions may help form a extremist identity or may lead to them relaxing their views. If Rome Weathers through the Third Century, An Alt-Constantine may come around and convert to Buddhism. Roman Buddhism would take on a more organizational role and will adopt pagan customs including their gods and would be closer to Mahayana Buddhism(the one practiced in East Asia). If Alt-Julian fails as in OTL then Buddhism would become the predominant religion of the Old World unless Persia manages to regain its power and enforces Zoroastrianism .
Buddhism would spread to the rest of Europe and as a result take Roman gods with it to an extent. Thor is Hercules and is the protector of Buddha and other Bodhisattvas and stuff like that. It may split into radically different sects and some may a take a more pagan form like Odin being a Bodhisattva who became a god after achieving Nirvana. This might be considered heretical by some, both Buddhists and Pagans. The "Buddhist Church" would never be as strong as the Catholic Church but would be stronger than old pagan offices. The Buddhists likely wont persecute other religions early on but would might eventually take upon a extreme shape and solidify itself into organized denominations with some level of communion . Animal Sacrifice and Gladiators may fade away after some time and be banned only after it is practically dead.
Buddhism was never as organized as I mentioned and was way less zealous In order for Buddhism to stay a organized religion which greatly affects people's lives and not just fade away like it did in India ,some of the changes I mentioned are required.
P.S: Tibetan Buddhism is the most organized version of Buddhism so I was partially wrong. Also reincarnation may play a important part in Court Politics and the clergy in some places may have significant power in choosing the King or Emperor and the 'Buddhist Patriarch' if he exists will probably be elected by the Clergy on the basis of reincarnation unless the patriarch was believed to have achieved Nirvana leading to disputes about his succession
Buddhism would spread to the rest of Europe and as a result take Roman gods with it to an extent. Thor is Hercules and is the protector of Buddha and other Bodhisattvas and stuff like that. It may split into radically different sects and some may a take a more pagan form like Odin being a Bodhisattva who became a god after achieving Nirvana. This might be considered heretical by some, both Buddhists and Pagans. The "Buddhist Church" would never be as strong as the Catholic Church but would be stronger than old pagan offices. The Buddhists likely wont persecute other religions early on but would might eventually take upon a extreme shape and solidify itself into organized denominations with some level of communion . Animal Sacrifice and Gladiators may fade away after some time and be banned only after it is practically dead.
Buddhism was never as organized as I mentioned and was way less zealous In order for Buddhism to stay a organized religion which greatly affects people's lives and not just fade away like it did in India ,some of the changes I mentioned are required.
P.S: Tibetan Buddhism is the most organized version of Buddhism so I was partially wrong. Also reincarnation may play a important part in Court Politics and the clergy in some places may have significant power in choosing the King or Emperor and the 'Buddhist Patriarch' if he exists will probably be elected by the Clergy on the basis of reincarnation unless the patriarch was believed to have achieved Nirvana leading to disputes about his succession
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