It’s usually thought that, among the founders of Protestantism, Martin Luther was the most (relatively) “Catholic” and “traditional.” That is true; however, it may surprise many to know how many traditional (literally or substantially Catholic) beliefs that John Calvin also retained. He was probably even more influential on the history of subsequent Protestantism than Luther was.
I don’t intend to imply that Calvin agrees with Catholics in every jot and tittle of all the following categories. What is agreed-upon is what is actually stated in these particular comments, which may sometimes be a part of a doctrine or practice. Two parties can agree, for example, on the basic fundamentals of a question, and then go on to differ on more minute particulars that each feels are a logical extension of the premises.