I’m not at all familiar with the beliefs or lack thereof for modern-day Calvinists. I believe that was a Christian based faith brought to the states by some of the last pilgrims, if I’m not mistaken.
Are most Calvinists pacifists as are most Quakers?
No, most Calvinists are definitely not pacifists. I’m not that familiar with the Quakers, but I don’t think there is any connection to Calvinism there.
Here is a short summary of Calvinist, also called Reformed, doctrine:
http://www.gotquestions.org/calvinism.html