As they remained Calvinists they could not preach a universal atonement; they were in fact extreme particular redemptionists.
In religious matters he was convinced of the necessity of a union between Lutherans and Calvinists, and took steps to bring this about.
In religious matters he interceded with the emperor and the diet for the Protestants, and sought, but without success, to bring about a reconciliation between Lutherans and Calvinists in Brandenburg.
In religious matters Calvinists and Lutherans were placed upon an equality, but the elector was unable to impress his own spirit of tolerance upon the clergy, who were occupied with ecclesiastical squabbles while the state of education and of public morals left much to be desired.
For some years there had been a war of words between the religious parties, known as the Gomarists (strict Calvinists) and the Arminians (moderate Calvinists).