Puppy,
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Please read what Catholic Answers says about heresies, including the heresy of Protestantism, at the following link:
catholic.com/library/great_heresies.asp
To commit heresy, one must refuse to be corrected. A person who is ready to be corrected or who is unaware that what he has been saying is against Church teaching is not a heretic.
A person must be baptized to commit heresy. This means that movements that have split off from or been influenced by Christianity, but that do not practice baptism (or do not practice valid baptism), are not heresies, but separate religions. Examples include Muslims, who do not practice baptism, and Jehovah’s Witnesses, who do not practice valid baptism.
Finally, the doubt or denial involved in heresy must concern a matter that has been revealed by God and solemnly defined by the Church (for example, the Trinity, the Incarnation, the Real Presence of Christ in the Eucharist, the sacrifice of the Mass, the pope’s infallibility, or the Immaculate Conception and Assumption of Mary).
To commit heresy, one must refuse to be corrected. A person who is ready to be corrected or who is unaware that what he has been saying is against Church teaching is not a heretic.
A person must be baptized to commit heresy. This means that movements that have split off from or been influenced by Christianity, but that do not practice baptism (or do not practice valid baptism), are not heresies, but separate religions. Examples include Muslims, who do not practice baptism, and Jehovah’s Witnesses, who do not practice valid baptism.
Finally, the doubt or denial involved in heresy must concern a matter that has been revealed by God and solemnly defined by the Church (for example, the Trinity, the Incarnation, the Real Presence of Christ in the Eucharist, the sacrifice of the Mass, the pope’s infallibility, or the Immaculate Conception and Assumption of Mary).
Among the heresies they ennumerate, is Protestantism:
Protestant groups display a wide variety of different doctrines. However, virtually all claim to believe in the teachings of
sola scriptura (“by Scripture alone”—the idea that we must use only the Bible when forming our theology) and
sola fide (“by faith alone”— the idea that we are justified by faith only).
The great diversity of Protestant doctrines stems from the doctrine of private judgment, which denies the infallible authority of the Church and claims that each individual is to interpret Scripture for himself. This idea is rejected in 2 Peter 1:20, where we are told the first rule of Bible interpretation: “First of all you must understand this, that no prophecy of Scripture is a matter of one’s own interpretation.” A significant feature of this heresy is the attempt to pit the Church “against” the Bible, denying that the magisterium has any infallible authority to teach and interpret Scripture.
The doctrine of private judgment has resulted in an enormous number of different denominations. According to
The Christian Sourcebook, there are approximately 20-30,000 denominations, with 270 new ones being formed each year. Virtually all of these are Protestant.