Fifteen of 54 weekly Torah portions have haftarahs (additional readings) from Isaiah.
“Fifteen of 54 weekly Torah portions have haftarahs (additional readings) from Isaiah.”
It appears I chose an unreliable source for the information about Isaiah. Others mention that Isaiah 53 is not read in synagogues, but the reason is not any diabolical plot to prevent congregants from reading it.
In Christian churches that do not follow a standardized liturgy, one might expect readings from any passage of scripture. However, some are more favored (in practice) than others, just as it is within Judaism.
The idea that the Masoretic text was altered due in part to an influence of Jewish Christianity (i.e. as a backlash to some of the claims of Jesus fulfilling ancient prophecies) is not original with me (obviously). But I think it is a reasonable explanation for some of the discrepancies between the the Masoretic text and other historical copies and translations (such as the Septuagint).