I believe it might be seen as heretical because the devil is after only one thing, and that not be a thing at all, but Christ Jesus Himself
So do you think the Devil is not behind ISIS’s persecution of Christians - if those Christians aren’t Roman Catholics?
The devil is behind everything evil that happens in this world, but there is nothing more Satan wants to conquer than Christ in the Most Holy Eucharist, for without it [Him], the world would fall into [complete] disrepair in no time at all.
if they are validly baptized, they are Catholic...