John Calvin and the Catholic Church had some similar, but different beliefs.
Differences:
Calvinism: There was belief of predestination. This is when God elects if you will be in heaven or hell from the beginning. Your actions later on in life will not change the decision.
Catholicism: Salvation could be gained from indulgences. That means you will have to do something to get rid of your sins if you have any.
Similarities:
Both believe that the Bible is an important source of doctrine and truth.
