Wholesale abandonment of the Companions' communal inheritance or recognized juristic guidance, even while invoking the Qur'an and Sunnah, can amount to a distinctive separation in religious method.
Three patterns should be distinguished:
Shudhudh: an individual departs from the larger body.
Khilaf: one group opposes another.
Firqah: a group separates its very religious basis and affiliation.
The terms are not interchangeable; each describes a different type of separation.