Calvinism, perhaps best known for it’s stand on Predestination, is a branch of Protestantism that differs from the Lutherans/Armenians on several points, laid out in what are known as the Five Points of Calvinism. Here is a post from the Reformed Theology website presenting both a Calvinist and non-Calvinist position.
Why/Why Not – a Calvinist
Reformed Theology – by John Samson
May 20, 2016: Dr. Michael Brown lays out the basic reasons why he is not a Calvinist:
May 21, 2016: Dr. James White responds – why I am a Calvinist: