Calvinists deny freewill, though the Bible affirms that freewill exists. Calvinists make God the author of sin and confusion. Calvinist deny John 3:16 that "whosoever" believes can be saved - and that instead of God offering salvation for the whole world, He only offers it to a select few that are already chosen -- and of course are Calvinists. Calvinist apologist James R. White said that if a little girl gets raped it's because God willed it to happen. Though God says in the Bible that if anyone were to harm one of these little ones . . . that it would be better if a millstone were tied around the neck of a person and that person be cast into the sea.
Even though Calvinists believe that God doesn't desire that all people be saved, the Bible says the opposite - that He is longsuffering, not willing that any should perish. Considering it is God's will that none should perish, one should ask why He would go against His own will? Quite confusing right? Like a God of confusion. No. We have freewill. This doesn't negate God's ability to be sovereign, nor to intercede and intervene. Freewill doesn't threaten God's power, that is a big misunderstanding. God is able to predict us with 100% accuracy, as He has infinite knowledge.
He's just that smart. And God didn't make robots, but wanted people to love Him in sincerity and in truth, out of understanding for all that He does for us, and appreciating Him for who He is. Jesus said He didn't come to condemn us, but to save us. John Calvin and his buddies had a man named Michael Servetus burned alive at the stake, because Servetus didn't agree with Calvinist theology, though Servetus was a Christian.
Calvinists/Reformed/Puritans, it's all the same thing. Those who burned the witches at Salem were the Puritans. For some reason, they liked to burn people.