Objection 1: It would seem that apostasy does not pertain to unbelief.

Therefore apostasy does not pertain to unbelief.

For that which is the origin of all sins, does not, seemingly, pertain to unbelief, since many sins there are without unbelief.

In this way apostasy, simply so called, pertains to unbelief.

Now it pertains to unbelief to believe such a thing.

3: Further, heresy, since it pertains to unbelief, is a determinate species of unbelief.

(1) Whether apostasy pertains to unbelief?