A list of some references proving Baptism was changed by the Catholic church from what Jesus taught and the Apostles practiced.
Biblical references:
Acts 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Acts 8:16 (For as yet he was fallen upon none of them: only they were baptized in the name of the Lord Jesus.)
Acts 10:48 And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
Acts 19:5 When they heard this, they were baptized in the name of the Lord Jesus.
Acts 22:16 And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.
Rom 6:3 Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?
Gal 3:27 For as many of you as have been baptized into Christ have put on Christ.
Col 2:12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.
1 Peter 3:21 The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Jesus Christ:
Why is baptism important?
Other references:
BRITANNICA ENCYCLOPEDIA 11TH edition, Vol 3, Pg 365-366 The baptismal formula was changed from the name of JESUS CHRIST to the words Father, Son, & Holy Ghost by the Catholic Church in the second century.
BRITANNICA ENCYCLOPEDIA Vol 3, Pg 82 Everywhere in the oldest sources it states that baptism took place in the name of Jesus Christ.
CANNEY ENCYCLOPEDIA OF RELIGION Pg 53 The early church always baptized in the name of the Lord Jesus until development of Trinity doctrine in the 2nd century.
CATHOLIC ENCYCLOPEDIA Vol 2, Pg 263 Here the Catholics acknowledged that baptism was changed by the Catholic Church.
http://en.wikisource.org/wiki/Page:Catholic_Encyclopedia,_volume_2.djvu/309
HASTINGS ENCYCLOPEDIA OF RELIGION Vol 2, Pg 377 Christian baptism was administered using the words “In the name of Jesus”. Vol 2, Pg 378 The use of a Trinitarian formula of any sort was not suggested in early Church history. Vol 2, Pg 389 Baptism was always in the name of Lord Jesus until the time of Justin Martyr when Triune formula was used.
CATHOLIC ENCYCLOPEDIA Vol 8 Justin Martyr was one of the early Fathers of the Roman Catholic Church.
HASTINGS ENCYCLOPEDIA OF RELIGION Vol 2, Pg 377 on ACTS 2:38 NAME was an ancient synonym for “person”. Payment was always made in the name of some person referring ownership. Therefore one being baptized in Jesus Name became his personal property. “Ye are Christ’s.”
NEW INTERNATIONAL ENCYCLOPEDIA Vol 22, Pg 477 The term “Trinity” was originated by Tertullian, a Roman Catholic Church Father.
ENCYCLOPEDIA OF RELIGION AND ETHICS (1951), II, 384, 389 The formula used was ‘in the name of the Lord Jesus Christ’ or some synonymous phrase; there is no evidence for the use of the trine name… The earliest form, represented in the Acts, was simple immersion….in water, the use of the name of the Lord, and the laying on of hands. To these were addedm at various times and places which cannot be safely identified, (a) the trine name (Justin)
INTERPRETERS DICTIONARY OF THE BIBLE (1962) I, 351 The evidence … suggests that baptism in early Christianity was administered, not in the threefold name, but ‘in the name of the Lord Jesus’.
A HISTORY OF CHRISTIAN THOUGHT (Otto Heick) (1965), I, 53 At first baptism was administered in the name of Jesus, but gradually in the name of the Triune God: Father, Son, and Holy Ghost.
HASTINGS DICTIONARY OF THE BIBLE (1898), I, 241 [One explanation is that] the original form of words was ‘into the name of Jesus Christ’. Baptism into the name of the Trinity was a later development.
A HISTORY OF THE CHRISTIAN CHURCH Williston Walker, (1947), Pg 58 The Trinitarian baptismal formula … was displacing the older baptism in the name of Christ.
THE NEW SCHAFF-HERZOG ENCYCLOPEDIA OF RELIGIOUS KNOWLEDGE (1957), I, 435 The New Testament knows only baptism in the name of Jesus …, which still occurs even in the second and third centuries.
CANNEY’S ENCYCLOPEDIA OF RELIGIONS (1970), Pg 53 Persons were baptized at first ‘in the name of Jesus Christ’ … or ‘in the name of the Lord Jesus.’… Afterwards, with the development of the doctrine of the Trinity, they were baptized ‘in the name of the Father and of the Son and of the Holy Ghost.
ENCYCLOPEDIA BIBLICA (1899), I, 473 It is natural to conclude that baptism was administered in the earliest times ‘in the name of Jesus Christ,’ or in that ‘of the Lord Jesus.’ This view is confirmed by the fact that the earliest forms of the baptismal confession appear to have been single – not triple, as was the later creed.
ENCYCLOPEDIA BRITANNICA 11TH edition, (1910), Vol 2, Pg 365 The Trinitarian formula and trine immersion were not uniformly used from the beginning… Bapti[sm] into the name of the Lord [was] the normal formula of the new Testament. In the 3rd century baptism in the name of Christ was still so wide spread that Pope Stephen, in opposition to Cyprian of Carthage, declared it to be valid.
The evidence is overwhelming. Baptising in the name of Jesus is obviously the way the apostles baptized in the first Church.