Could you give us some information on these alleged Churchs=especially the doctrines they adhered to. Thanks!
Well they are what you would call heresies. Many of them too.
The Circumcisers (1st Century)
The Circumcision heresy may be summed up in the words of Acts 15:1: “But some men came down from Judea and were teaching the brethren, ‘Unless you are circumcised according to the custom of Moses, you cannot be saved.’”
Many of the early Christians were Jews, who brought to the Christian faith many of their former practices. They recognized in Jesus the Messiah predicted by the prophets and the fulfillment of the Old Testament. Because circumcision had been required in the Old Testament for membership in God’s covenant, many thought it would also be required for membership in the New Covenant that Christ had come to inaugurate. They believed one must be circumcised and keep the Mosaic law to come to Christ. In other words, one had to become a Jew to become a Christian.
But God made it clear to Peter in Acts 10 that Gentiles are acceptable to God and may be baptized and become Christians without circumcision. The same teaching was vigorously defended by Paul in his epistles to the Romans and the Galatians—to areas where the Circumcision heresy had spread.
Gnosticism (1st and 2nd Centuries)
“Matter is evil!” was the cry of the Gnostics. This idea was borrowed from certain Greek philosophers. It stood against Catholic teaching, not only because it contradicts Genesis 1:31 (“And God saw everything that he had made, and behold, it was very good”) and other scriptures, but because it denies the Incarnation. If matter is evil, then Jesus Christ could not be true God and true man, for Christ is in no way evil. Thus many Gnostics denied the Incarnation, claiming that Christ only appeared to be a man, but that his humanity was an illusion. Some Gnostics, recognizing that the Old Testament taught that God created matter, claimed that the God of the Jews was an evil deity who was distinct from the New Testament God of Jesus Christ. They also proposed belief in many divine beings, known as “aeons,” who mediated between man and the ultimate, unreachable God. The lowest of these aeons, the one who had contact with men, was supposed to be Jesus Christ.
Montanism (Late 2nd Century)
Montanus began his career innocently enough through preaching a return to penance and fervor. His movement also emphasized the continuance of miraculous gifts, such as speaking in tongues and prophecy. However, he also claimed that his teachings were above those of the Church, and soon he began to teach Christ’s imminent return in his home town in Phrygia. There were also statements that Montanus himself either was, or at least specially spoke for, the Paraclete that Jesus had promised would come (in reality, the Holy Spirit).
Sabellianism (Early 3rd Century)
The Sabellianists taught that Jesus Christ and God the Father were not distinct persons, but two aspects or offices of one person. According to them, the three persons of the Trinity exist only in God’s relation to man, not in objective reality.
Arianism (4th Century)
Arius taught that Christ was a creature made by God. By disguising his heresy using orthodox or near-orthodox terminology, he was able to sow great confusion in the Church. He was able to muster the support of many bishops, while others excommunicated him.
Arianism was solemnly condemned in 325 at the First Council of Nicaea, which defined the divinity of Christ, and in 381 at the First Council of Constantinople, which defined the divinity of the Holy Spirit. These two councils gave us the Nicene creed, which Catholics recite at Mass every Sunday.
Pelagianism (5th Century)
Pelagius denied that we inherit original sin from Adam’s sin in the Garden and claimed that we become sinful only through the bad example of the sinful community into which we are born. Conversely, he denied that we inherit righteousness as a result of Christ’s death on the cross and said that we become personally righteous by instruction and imitation in the Christian community, following the example of Christ. Pelagius stated that man is born morally neutral and can achieve heaven under his own powers. According to him, God’s grace is not truly necessary, but merely makes easier an otherwise difficult task.
Semi-Pelagianism (5th Century)
After Augustine refuted the teachings of Pelagius, some tried a modified version of his system. This, too, ended in heresy by claiming that humans can reach out to God under their own power, without God’s grace; that once a person has entered a state of grace, one can retain it through one’s efforts, without further grace from God; and that natural human effort alone can give one some claim to receiving grace, though not strictly merit it.
There were many more, but i just named a few.