Their position in Christ has to do with what the individual does with the errors in Catholic doctrine and what their foundation is built on. Of course, such errors or rejection of errors differ from Catholic to Catholic. There are many Catholics that do not agree with some of the positions below, but many do as well. That said...
Both Catholic and Roman Catholic religions are considered a sect of Christianity. However, their roots are full of error. Why else did they burn other Christians for just wanting to interpret the Latin Bible into English and German? For example, William Tyndale was tried on a charge of heresy in 1536 and condemned to the stake for translating the New Testament into the common man's English. Tyndale was burned alive on 6 October 1536.
Here is what I have found from my own studies on the matter (having been raised Catholic). I have noted some references for those who will appose the list below.
Catholics adhere to the Pope as the vicar of Christ.
Catholic Encyclopedia, "Vicarius Christi"
Christians believe that the Bible is the final authority.
2 Timothy 3:16
Catholic tradition is of equal authority with the Bible.
Catechism of the Catholic Church
Christians believe traditions of man cause error.
Matthew 15:3
Catholics adhere to Mary as a co-regent of Jesus.
UBI PRIMUM, (On the Immaculate Conception of Mary), Encyclical of Pope Pius IX
Christians beleive that Mary was blessed, but only human.
Luke 11:27-28
Catholics believe that priests or Mary are mediators.
OCTOBRI MENSE (On the Rosary), Encyclical of Pope Leo XIII
Christians believe there that only Jesus is Mediator.
1 Timothy 2:5
Transubstantiation recrucified Christ at the communion.
Council of Trent Pg. 347, #1376,
Christians believe Christ died just once.
Hebrews 6:6
Catholics believe Mary was a perpetual virgin.
Protoevangelium of James], Patrology, 1:120–1 and many sources
Christians believe the Bible that He had siblings.
Mark 6:3
Catholics call their priests "father".
Started with St. Benedict referring to confessors as "abbot" from "abba"
Catholics call their teachers "pastor" or "minister".
Matthew 23:9
Catholics pray repetitive words with Rosary Beads.
Catholic Encyclopedia, Ingruentium Malorum
Christians pray the same as they speak.
Matthew 6:7
Pope canonizes those to be called "saints".
Caractéristiques des Saints (Paris, 1867)
Christians believe all who believe are saints.
Philippians 1:1
Pope (through bishops) decides who is "priest" in church leadership.
Council of Nicaea I, canon 18
Christians believe all who believe are a priesthood.
1 Peter 2:5
Celibacy is enforced on priests and bishops.
Bishops Committee on Priestly Life, page 54
Christians believe they should be married.
1 Timothy 3:2-5
Catholics believe Peter was the first Pope (so could not have been married)
Primacy of Peter and Apostolic Succession
Christians stand by the Bible that he was married and was not a "pope".
Mark 1:30
Catholics bow down and burn candles to graven images.
debitum honorem et venerationem
Christians do not bow to images.
1 John 5:21
Catholics believe only the priests can understand the Bible.
(main cause of the Reformation and martyrdom of translators)
Christians believe they can study and understand the Bible.
Ephesians 3:4
Catholics believe Mary was without sin.
Council of Trent (Session VI, Canon 23)
Christians believe only Jesus was without sin.
Romans 5:12
Justification pronounced as anathema by Council of Trent.
Council of Trent (Canon 9)
Christians believe we are justified by faith.
Romans 3:28
Catholics hold to Peter as foundation "rock" of the church.
Acts of the Council, session 3
Christians hold to only Christ as foundation Rock.
1 Corinthians 3:11, 1 Corinthians 10:4
Catholics worship Mary as the Mother of God.
Council of Ephesus, Theotokos
Christians only worship the Godhead.
Revelation 19:10
