How could a fourth Abrahamic religion arise? And how far could it spread?
Also, is there any way to fit into into OTL historical events or series of events (OTL people starting the religion not required but possible)? Multiple slave rebellions had leaders who claimed to have been given messages from God (well, John Brown's and Nat Turner's rebellions at least). In addition, if a 'heresy' rises before or shortly after a huge cataclysmic event like a very fast epidemic or a huge earthquake, then it maybe able to establish itself as people are desperate (especially if the leader of the group predicts God's wrath shortly before the earthquake and people see it as a prophesy).
Also, is there any way to fit into into OTL historical events or series of events (OTL people starting the religion not required but possible)? Multiple slave rebellions had leaders who claimed to have been given messages from God (well, John Brown's and Nat Turner's rebellions at least). In addition, if a 'heresy' rises before or shortly after a huge cataclysmic event like a very fast epidemic or a huge earthquake, then it maybe able to establish itself as people are desperate (especially if the leader of the group predicts God's wrath shortly before the earthquake and people see it as a prophesy).