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If they don’t know about any other Catholic dogmas (other than the Trinity and Incarnation) then they are not heretics but Catholics [Christians], unless they hold a position that is incompatible with Faith in the Trinity and Incarnation or deny a truth that all know about God and the natural law or deny something that they know to be clearly taught in Scripture. For instance, if the baptized person described above claims to believe in the Trinity and Incarnation but holds that all religions are more or less good, then he is a heretic and does not have the Catholic Faith (even before he knows that such a position is condemned by the Church) because his belief is incompatible with true Faith in the Trinity as the one true God, which belief he must have to be said to have the Catholic Faith in its simplest components.
Pope Pius XI, Mortalium Animos (# 2), Jan. 6, 1928:

“…that false opinion which considers all religions to be more or less good and praiseworthy... Not only are those who hold this opinion in error and deceived, but also in distorting the idea of true religion they reject it...”

Another example would be if the baptized person who believes in the Trinity and the Incarnation (which are the simplest components of the Catholic Faith) and has never heard of other Catholic dogmas holds that man does not have free will (which some Protestants teach). This person would also become a heretic even before he has seen his position condemned by the Church and before he has heard of other Catholic dogmas (other than the Trinity and Incarnation) because he is rejecting a truth which all know to be true from the natural law, namely, that man has a free will. Thus, he is denying a truth all know about man from the natural law and he is a heretic.
Another example would be if the baptized person who believes in the Trinity and Incarnation (the Catholic Faith in its simplest components) and has never heard of other Catholic dogmas refuses to believe that God is a rewarder and a punisher. This person is a heretic, even though he has never seen that his position is condemned by the Church and has never heard of other Catholic dogmas, because he rejects a truth he knows to be true from the natural law, that God is a rewarder and a punisher of our actions (see Heb. 11:6).
A large majority of Protestants today believe in the doctrines of “faith alone” and “eternal security.” These doctrines contradict both the natural law and reason which says that every man shall be rewarded or punished for his deeds. It also contradicts, word for word, the teaching of James 2 in scripture, which teach that faith without works is dead, and that man is not saved by faith alone. This person who believes in faith alone or eternal security is a heretic, even though he has never seen that his position is condemned by the Church and has never heard of other Catholic dogmas, because he rejects a truth he knows to be true from the natural law, that God is a rewarder and a punisher of our actions, and that faith alone does not justify a man only, but our deeds also.
Other common heresies against the natural law is to hold that birth control or natural family planning, also called nfp, which many “Catholics” practise to avoid conception, (which makes them guilty of the mortal sin of contraception) is acceptable, or if a person is to hold that abortion is acceptable, or if a person is to hold that the consuming of mind altering drugs to the point where the conscience is impeded is acceptable. These examples would all fall under the category of deadly sin, because he is rejecting a truth which all know to be true from the natural law, namely, 1) that abortion is murder, 2) that contraception or nfp deliberately frustrates the natural power to generate life, 3) and that mind altering drugs such as smoking marijuana is a mortal sin, just like getting drunk is.
Pope Pius XII, Mystici Corporis Christi (# 23), June 29, 1943:

“For not every sin, however grave it may be, is such as of its own nature to sever a man from the Body of the Church, as does schism or heresy or apostasy.”

We can see that it’s the teaching of the Catholic Church that a man is severed from the Church and Salvation by heresy, schism or apostasy.
The baptized children who reach the age of reason in Protestant, Eastern Schismatic, etc. church buildings and believe in the Trinity and the Incarnation (the essential components of the Catholic Faith) and who don’t reject any Catholic dogma because they don’t know of any other than the Trinity and Incarnation, and who don’t embrace any of the positions like those described above, which are directly incompatible with Faith in God, Jesus Christ, the Trinity, the Natural Law or what they know to be clearly taught in Scripture, would be Catholics in a heretical church building.

THERE IS NO SALVATION FOR MEMBERS OF ISLAM, JUDAISM OR OTHER HERETICAL OR SCHISMATIC NON-CATHOLIC SECTS
So far we’ve seen that it’s an infallibly defined dogma that all who die as non-Catholics, including all Jews, pagans, heretics, schismatics, etc. cannot be saved. They need to be converted to have salvation. Now we must take a brief look at more of what the Church specifically says about some of the prominent non-Catholic religions, such as Judaism, Islam, and the Protestant and Eastern schismatic sects. This will illustrate, once again, that those who hold that members of non-Catholic religions can be saved are not only going against the solemn declarations that have already been quoted, but also the specific teachings quoted below.
SPECIFIC CATHOLIC TEACHING AGAINST JUDAISM
Jews practice the Old Law and reject the Divinity of Christ and the Trinity. The Jews reject Our Lord Jesus Christ and call him a deceiver, yet many “Christians” say that they are good? This is mind-blowing! The Church teaches the following about the cessation of the Old Law and about all who continue to observe it:
Pope Eugene IV, Council of Florence, 1441, ex cathedra: “The Holy Roman Church firmly believes, professes and teaches that the matter pertaining to the law of the Old Testament, the Mosaic law, which are divided into ceremonies, sacred rites, sacrifices, and sacraments… after our Lord’s coming… ceased, and the sacraments of the New Testament began,and that whoever, even after the passion, placed hope in these matters of the law and submitted himself to them as necessary for salvation, as if faith in Christ could not save without them, sinned mortally. All, therefore, who after that time (the promulgation of the Gospel) observe circumcision and the Sabbath (not to be mistaken with the Christian Sabbath) and the other requirements of the law, the holy Roman Church declares alien to the Christian faith and not in the least fit to participate in eternal salvation.”
Many people, who call themselves Catholic, do also boldly assert in contradiction of this infallible statement by Pope Eugene IV in the Council of Florence, that Jews who either reject Christ or who have not found or accepted Christ as their Messiah, can be saved. They also contradict our Lord’s words in the gospel.