Although influenced by Socinian works such as the Bibliotheca Fratrum Polonorum,
Voltaire's skeptical attitude to the Bible separated him from Unitarian theologians like Fausto Sozzini or even Biblical-political writers like John Locke.
Both Calvinist and
Catholic clergy mounted fierce opposition against the group, but Socinian ministers took advantage of the atmosphere of religious tolerance,
promoted by such Polish kings as Sigismund II Augustus and Stephen Báthory, to teach their ideas.
For Trinitarian theology believes that the Son is not the Holy Spirit, while Arian theology believes that the Son is an angelic creation who could
not be the indwelling Holy Spirit, while Socinian theology believes that the son is just
a special man who could not be the Holy Spirit of God.