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let's say the sasanids are the only power in the reigion in 633 and control most of the byzantine empire of OTL, and are also pwerful enhauf to controll all the land they have. let's also say they, togeyher with axum, take control of arabia and start opressing islam, killing islamic leaders like muhammad. would islam still stay a living religion, or would the sasanids succesfully shut it down? how long would islam survive in such a scenario,and how much weaker would it be? if it would survive, how would such oppresion effect it?
in such a timeline where the OTL enemies of the sasanids do not exist (byzantine empire, rashidun chalifate ext...), what kind of event could you imagine making the sasanids fall? (or would they just take over the world )