While there have been variations in biblical texts over time due to copyist errors, variations between manuscripts, and translation differences, these variations do not necessarily equate to corruption.
"They write down not what they find but what they think is the meaning; and while they attempt to rectify the errors of others, they merely expose their own" – St. Jerome, Epist. lxxi.5
"Learned men, so called Correctores were, following the church meeting at Nicea 325 AD, selected by the church authorities to scrutinize the sacred texts and rewrite them in order to correct their meaning in accordance with the views which the church had just sanctioned.” – Eberhard Nestle
"...theological disputes, specifically disputes over Christology, prompted Christian scribes to alter the words of scripture in order to make them more serviceable for the polemical task. Scribes modified their manuscripts to make them more patently ‘orthodox’ and less susceptible to ‘abuse’ by the opponents of orthodoxy” – Bart D. Ehrman, The Orthodox Corruption of Scripture
"The manuscripts of the New Testament preserve traces of two kinds of dogmatic alterations: those which involve the elimination or alteration of what was regarded as doctrinally unacceptable or inconvenient, and those which introduce into the Scriptures proof for a favorite theological tenet or practice" – Vincent Taylor, The Text of the New Testament
Constantine's primary role was to convene the First Council of Nicaea in 325 CE to address theological disputes, particularly the Arian controversy, not to insert pagan doctrines.
"In the year 325 A.D. was perpetrated one of the most colossal frauds and deceptions in the annals of history. This was the date of the Council of Nicea, whose task it was to create a new religion that would be acceptable to Emperor Constantine..." – R. W. Bernard, The Historical Apollonius Versus the Mythical Jesus
“Constantine himself said, “Let us then have nothing in common with the detestable Jewish crowd.” – Eusebius, Life of Constantine 3, 18-19, Nicene and Post-Nicene Fathers, 1979, second series, Vol. 1, pp. 524-525
"The Council of Nicea was a pivotal event in the history of Christianity. The sudden adoption of a quasi-philosophic term to define the historic Jesus as equal to God was a major departure from scripture and tradition. Further, the use of this term 'trinity' in a Creed meant that, from 325 on, Nicenes could and did proclaim other dogmas that have no basis in Scripture" – State Church of the Roman Empire; Ben H. Swett; 1998
In regard to the fourth point:
"The day was to come when the Nicene party won out completely and then the emperors... decreed that one who denied the Trinity should be put to death […] the conquest of the East was immediately followed by an edict which announced their total destruction“ – The Church of our Fathers - 1950, pg. 46
“The doctrine that Jesus Christ the Son of God was God the son was decreed by worldly and ecclesiastical powers. Men were forced to accept it at the point of the sword or else, Thus, the error of the trinity was propounded to the end that ultimately people believed it to be the truth. Thus Christianity became in essence like Babylonian heathenism, with only a veneer of Christian names.” — Victor Paul Wierwille (1983), Forgers of the Word
While there have been variations in biblical texts over time due to copyist errors, variations between manuscripts, and translation differences, these variations do not necessarily equate to corruption.
"They write down not what they find but what they think is the meaning; and while they attempt to rectify the errors of others, they merely expose their own" – St. Jerome, Epist. lxxi.5
"Learned men, so called Correctores were, following the church meeting at Nicea 325 AD, selected by the church authorities to scrutinize the sacred texts and rewrite them in order to correct their meaning in accordance with the views which the church had just sanctioned.” – Eberhard Nestle
"...theological disputes, specifically disputes over Christology, prompted Christian scribes to alter the words of scripture in order to make them more serviceable for the polemical task. Scribes modified their manuscripts to make them more patently ‘orthodox’ and less susceptible to ‘abuse’ by the opponents of orthodoxy” – Bart D. Ehrman, The Orthodox Corruption of Scripture
"The manuscripts of the New Testament preserve traces of two kinds of dogmatic alterations: those which involve the elimination or alteration of what was regarded as doctrinally unacceptable or inconvenient, and those which introduce into the Scriptures proof for a favorite theological tenet or practice" – Vincent Taylor, The Text of the New Testament
In address of the second and third point:
"In the year 325 A.D. was perpetrated one of the most colossal frauds and deceptions in the annals of history. This was the date of the Council of Nicea, whose task it was to create a new religion that would be acceptable to Emperor Constantine..." – R. W. Bernard, The Historical Apollonius Versus the Mythical Jesus
“Constantine himself said, “Let us then have nothing in common with the detestable Jewish crowd.” – Eusebius, Life of Constantine 3, 18-19, Nicene and Post-Nicene Fathers, 1979, second series, Vol. 1, pp. 524-525
And the fourth point:
"The day was to come when the Nicene party won out completely and then the emperors... decreed that one who denied the Trinity should be put to death […] the conquest of the East was immediately followed by an edict which announced their total destruction“ (The Church of our Fathers - 1950, pg. 46)
“The doctrine that Jesus Christ the Son of God was God the son was decreed by worldly and ecclesiastical powers. Men were forced to accept it at the point of the sword or else, Thus, the error of the trinity was propounded to the end that ultimately people believed it to be the truth. Thus Christianity became in essence like Babylonian heathenism, with only a veneer of Christian names.” — Victor Paul Wierwille (1983), Forgers of the Word