Roman Empire divided into three in the crisis of the third century

What if in the crisis of the third century the Roman Empire had not been able to regain the territories lost in the secession that occurred in the year 260 AD, thus having the Gallic Empire and the Palmyrene Empire succeeded in the separation?

Map_of_Ancient_Rome_260-269_AD-pt.svg.png
 
A Gallic Empire-Arian Visigothic? The palmyrene Empire would contain later the Islamic expansion? Only the "central" Roman Empire became Christianity, or we'd have three large blocks independent and parallel Christians? Without a unified power, could establish an orthodoxy Christianity?
 
A Gallic Empire-Arian Visigothic? The palmyrene Empire would contain later the Islamic expansion? Only the "central" Roman Empire became Christianity, or we'd have three large blocks independent and parallel Christians? Without a unified power, could establish an orthodoxy Christianity?

Due to massive butterflies there would not be any Islam. I am growing increasingly tired of people mass murdering butterflies...
 
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