That's not exactly how I would state it, but yes.
Protestants are separated brethren but they are not in full communion with the body of Christ.
Protestant churches teach many contradictory doctrines and therefore, by definition, must be teaching some false doctrines.
The Church founded by Jesus is led in ALL truth.
False doctrines, let's take a look.
Heresy Date
OF ALL THE HUMAN TRADITIONS taught and practiced by the Roman Catholic Church, which are contrary to the Bible, the most ancient are the
prayers for the dead and the
sign of the Cross. Both began 300 years after Christ. 310
Wax Candles introduced in church 320
Veneration of angels and dead saints 375
The Mass, as a daily celebration, adopted 394
The
worship of Mary, the mother of Jesus, and the use of the term, "Mother of God", as applied to her, originated in the Council of Ephesus 431
Priests began to dress differently from the laity 500
Extreme Unction 526
The doctrine of
Purgatory was first established by Gregory the Great 593
The
Latin language, as the language of prayer and worship in churches, was also imposed by Pope Gregory I. 600 years after Christ
The Word of God forbids praying and teaching in an unknown tongue. (1st Corinthians 14:9). 600
The Bible teaches that we pray to God alone. In the primitive church never were
prayers directed to Mary, or to dead saints. This practice began in the Roman Church.
(Matthew 11:28; Luke 1:46; Acts 10:25-26; 14:14-18) 600
The
Papacy is of pagan origin. The title of
pope or universal bishop, was first given to the bishop of Rome by the wicked emperor Phocas.
This he did to spite Bishop Ciriacus of Constantinople, who had justly excommunicated him for his having caused the assassination of his predecessor emperor Mauritius. Gregory 1, then bishop of Rome, refused the title, but his successor, Boniface III, first assumed title "pope."
Jesus did not appoint Peter to the headship of the apostles and forbade any such notion. (Luke 22:24-26; Ephesians 1:22-23; Colossians 1:18; 1st Corinthians 3:11).
Note: Nor is there any mention in Scripture, nor in history, that Peter ever was in Rome, much less that he was pope there for 25 years; Clement, 3rd bishop of Rome, remarks that "there is no real 1st century evidence that Peter ever was in Rome." 610
The kissing of the Pope's feet
It had been a pagan custom to kiss the feet of emperors. The Word of God forbids such practices. (Read Acts 10:25-26; Revelation 19:10; 22:9). 709
The Temporal power of the Popes
When Pepin, the usurper of the throne of France, descended into Italy, called by Pope Stephen II, to war against the Italian Lombards, he defeated them and gave the city of Rome and surrounding territory to the pope. Jesus expressly forbade such a thing, and He himself refused worldly kingship. (Read Matthew 4:8-9; 20:25-26; John 18:38). 750
Worship of the cross, images and relics was authorized
This was by order of Dowager Empress Irene of Constantinople, who first caused to pluck the eyes of her own son, Constantine VI, and then called a church council at the request of Hadrian I, pope of Rome at that time.
Such practice is called simply IDOLATRY in the Bible, and is severely condemned. (Read Exodus 20:4; 3:17; Deuteronomy 27:15; Psalm 115). 788
Holy Water, mixed with a pinch of salt and blessed by the priest, was authorized 850
The
veneration of St. Joseph began 890
The
baptism of bells was instituted by Pope John XIV 965
Canonization of dead saints, first by Pope John XV
Every believer and follower of Christ is called saint in the Bible. (Read Romans 1:7; 1st Colossians 1:2). 995
Fasting on Fridays and during
Lent were imposed
Imposed by popes said to be interested in the commerce of fish. (Bull, or permit to eat meat), some authorities say, began in the year 700. This is against the plain teaching of the Bible. (Read Matthew 15:10; 1st Corinthians 10:25; 1st Timothy 4:1-3). 998
The
Mass was developed gradually as a sacrifice; attendance made obligatory in the 11th century.
The Bible teaches that the sacrifice of Christ was offered once and for all, and is not to be repeated, but only commemorated in the Lord's Supper. (Read Hebrews 7:27; 9:26-28; 10:10-14).
The
celibacy of the priesthood was decreed by Pope Hildebrand, Boniface VII
Jesus imposed no such rule, nor did any of the apostles. On the contrary, St. Peter was a married man, and St. Paul says that bishops were to have wife and children. (Read 1st Timothy 3:2,5, and 12; Matthew 8:14-15). 1079
The
Rosary, or prayer beads was introduced by Peter the Hermit, in the year 1090. Copied from Hindus and Mohammedans
The counting of prayers is a pagan practice and is expressly condemned by Christ. (Matthew 6:5-13). 1090
The
Inquisition of heretics was instituted by the Council of Verona in the year 1184. Jesus never taught the use of force to spread His religion 1184
The sale of
Indulgences, commonly regarded as a purchase of forgiveness and a permit to indulge in sin.
Christianity, as taught in the Bible, condemns such a traffic and it was the protest against this traffic that brought on the Protestant Reformation in the 16th century. 1190
The dogma of
Transubstantiation was decreed by Pope Innocent III, in the year
By this doctrine the priest pretends to perform a daily miracle by changing a wafer into the body of Christ, and then he pretends to eat Him alive in the presence of his people during Mass. The Bible condemns such absurdities; for the Lord's Supper is simply a memorial of the sacrifice of Christ. The spiritual presence of Christ is implied in the Lord's Supper. (Read Luke 22:19-20; John 6:35; 1st Corinthians 11:26). 1215
Confession of sin to the priest at least once a year was instituted by Pope Innocent III., in the Lateran Council
The Bible commands us to confess our sins direct to God. (Read Psalm 51:1-10; Luke 7:48; 15:21; 1st John 1:8-9). 1215
The
adoration of the wafer (Host), was decreed by Pope Honorius
So the Roman Church worships a God made by human hands. This is plain idolatry and absolutely contrary to the spirit of the Gospel. (Read John 4:24). 1220
The
Bible forbidden to laymen and placed in the Index of forbidden books by the Council of Valencia
Jesus commanded that the Scriptures should be read by all. (John 5:39; 1st Timothy 3:15-17). 1229
The
Scapular was invented by Simon Stock, and English monk
It is a piece of brown cloth, with the picture of the Virgin and supposed to contain supernatural virtue to protect from all dangers those who wear it on naked skin. This is fetishism. 1287
The Roman Church
forbade the cup to the laity, by instituting the communion of one kind in the Council of Constance
The Bible commands us to celebrate the Lord's Supper with unleavened bread and the fruit of the vine. (Read Matthew 26:27; 1st Corinthians 11:26-29). 1414
The
doctrine of Purgatory was proclaimed as a dogma of faith by Council of Florence
There is not one word in the Bible that would teach the purgatory of priests. The blood of Jesus Christ cleanseth us from all sins. (Read 1st John 1:7-9; 2:1-2; John 5:24; Romans 8:1). 1439
The doctrine of
7 Sacraments affirmed
The Bible says that Christ instituted only two ordinances, Baptism and the Lord's Supper. (Read Matthew 28:19-20; 26:26-28). 1439
The
Ave Maria, part of the last
It was completed 50 years afterward and finally approved by Pope Sixtus V, at the end of the 16th century. 1508
The Council of Trent, held in the year 1545, declared that
Tradition is of equal authority with the Bible
By tradition is meant human teachings. The Pharisees believed the same way, and Jesus bitterly condemned them, for by teaching human tradition, they nullified the commandments of God. (Read Mark 7:7-13; Colossians 2:8; Revelation 22:18). 1545
The
apocryphal books were added to the Bible also by the Council of Trent
These books were not recognized as canonical by the Jewish Church. (See Revelation 22:8-9). 1546
The
Creed of Pope Pius IV was imposed as the official creed 1560 years after Christ and the apostles
True Christians retain the Holy Scriptures as their creed. Hence their creed is 1500 years older than the creed of Roman Catholics. (Read Galatians 1:8). 1560
The
Immaculate Conception of the Virgin Mary was proclaimed by Pope Pius IX
The Bible states that all men, with the sole exception of Christ, are sinners. Mary herself had need of a Savior. (Read Romans 3:23; 5:12; Psalm 51:5; Luke 1:30,46,47). 1834
In the year 1870 after Christ, Pope Pius IX proclaimed the dogma of
Papal Infallibility
This is a blasphemy and the sign of the apostasy and of the antichrist predicted by St. Paul. (Read 2nd Thessalonians 2:2-12; Revelation 17:1-9; 13:5-8,18).
Many Bible students see the number of the beast (Rev. 13:18), 666 in the Roman letters of the Pope's title: "VICARIVS FILII DEI." -- V-5, I-1; C-100, I-1; V-S, I-1; L-50, I-1; I-1; D-500, I-l — Total, 666. 1870
Pope Plus X, in the year 1907, condemned together with "Modernism", all the discoveries of modern science which are not approved by the Church
Pius IX had done the same thing in the Syllabus of 1864. 1907
In the year 1930 Pius XI,
condemned the Public Schools 1930
In the year 1931 the same pope Pius XI, reaffirmed the doctrine that Mary is
"the Mother of God"
This doctrine was first invented by the Council of Ephesus in the year 431. This is a heresy contrary by Mary's own words. (Read Luke 1:46-49; John 2: l-5). 1931
In the year 1950 the last dogma was proclaimed by Pope Pius XII, the
Assumption of the Virgin Mary 1950