Would Orthdox Chrisianity be larger than Catholcism had Islam never risen?

[CatoMinor]

With the fall of the eastern centers of early Christianity early on, and the eventual fall of Constantinople, the eastern Christians were rather limited in their ability to proliferate aside from the slavic peoples. However without the expansion of Islam could the eastern churches have grown much out east in central Asia in the place of Islam? Perhaps a christian version of the Mughal dynasty in India could have popped up lol.

[President Tyrion]

With the fall of the eastern centers of early Christianity early on, and the eventual fall of Constantinople, the eastern Christians were rather limited in their ability to proliferate aside from the slavic peoples. However without the expansion of Islam could the eastern churches have grown much out east in central Asia in the place of Islam? Perhaps a christian version of the Mughal dynasty in India could have popped up lol.

Hinduism predates Islam and Christianity by centuries. I think if Islam were to be just a figment of imagination, Hinduism would be the big winner. I know that doesn't answer your question, of course.

To your question, I think Catholicism would have a larger base, if only because Orthodoxy would still be competing with the Eastern religions in the Middle East. North Africa, however, would more likely become Catholic than Orthodox.

[DC Al Fine]

I'd suggest no simply because Orthodox Christianity grew in many places because of Islam with the threat of Islam, Orthodoxy turned it's orientation outwards towards the Slavs and Russians. Some of that growth would not have taken place had Islam not conquered some of the eastern sees.

[True Federalist (진정한 연방 주의자)]

Without the rise of Islam I think Persia would have remained Zoroastrian and Nestorian Christian and precluded a further spread of the Greek Rite into India and China than happened.  Not only that, but I think the major beneficiary of no Islam would not have been Constantinople and the Greek Rite but Alexandria and the Coptic Rite which likely would have spread further into Africa than it did.

We tend to focus mainly on the Latin-Greek split because the Coptic Rite of Alexandria and Syriac Rite of Antioch were so dampened under Islamic rule.