schismatic

Of or pertaining to a schism.

Of or pertaining to a schisma.

Divisive.

schismatic opinions or proposals

A person involved in a schism.

He semeth a sysmatyke Or els an heretike, For fayth in hym is faynte.

Amid heretics and schismatics, spoilers of the church’s lands, and scoffers at saints and sacraments, there remains a remnant.