The intellectual, social, and religious upheaval of the fifteenth and sixteenth centuries of which the Renaissance and the Protestant Revolution were phases, along with the decidedly skeptical tendency of the Scotist philosophy which undermined the arguments by which the great mysteries of the Christian faith had commonly been supported while accepting unconditionally the dogmas of the Church—together with the influence of Neoplatonizing mysticism which aimed and claimed to raise its subjects into such direct and complete union and communion with the Infinite as to make any kind of objective authority superfluous:—all these influences conspired to lead many of the most conscientious and profoundly religious thinkers of the sixteenth century to reject simultaneously the baptism of infants and the traditional doctrine of the Trinity. Infant baptism they regarded as being without scriptural warrant, subversive of an ordinance of Christ, and inconsistent with regenerate church membership. Likewise the doctrine of the tripersonality of God, as set forth in the so-called Nicene and Athanasian creeds, involving the co-eternity, co-equality and consubstantiality of the Son with the Father and the personality of the Holy Spirit, they subjected to searching and fundamental criticism.
Adam Pastor, Antitrinitarian Antipædobaptist