Calvinists teach that God saves unbelievers and those who hate Him.
Nah. That's what God says: "While we were still sinners, Christ died for us" (Romans 5:8). Imagine that!
"For if, while we were God's enemies, we were reconciled to him through the death of his Son, how much more, having been reconciled, shall we be saved through his life!"(Romans 8:10) Imagine that!