To believe that God predestinates people to hell before they are born is the height of spiritual depravity. You might be better off to believe in no God at all than to believe that God predestinates people to hell before they are born. To believe that God predestinates people to hell before they are born is to believe that God is an unjust, unrighteous, unmerciful, tyrant. The Bible plainly teaches that God's people are justified by faith. They are justified by faith in God and his righteousness.
Paul wrote, "To declare, I say, at this time his righteousness: that he might be just, and the justifier of him that believes in Jesus., Romans 3:26. It is not possible to believe that God is righteous when he condemns people to hell before they are born. We believe that God and his Son Jesus Christ are righteous and can be trusted. This results in our justification. If you don't believe that God and Jesus Christ are righteous, then you are not a Christian. The God of Calvinism is unrighteous and is depraved. It is not spiritually possible to have faith in the God of Calvinism.
What you believe God is like will be reflected in the way that you live. If you believe that God is merciful, you will be merciful also. John Calvin was responsible for the deaths of hundreds of Christians. He was known as the tyrant of Genevia. If you want to know more about John Calvin, google, "The Recorded Atrocities of John Calvin". To say that John Calvin was depraved might be an understatement. Because he was depraved, he invented a depraved religion and named it after himself.
There are dozens and dozens of scriptures that refute Calvinism. The most hated scripture of Calvinism is John 3:16. "God so loved the world that he gave his only begotten Son that whosoever that believes in him should not perish". They also hate the words "Whosoever" "All" "Everyone" "World". We have a responsibility to preach the Gospel to everyone regardless of what they believe. If you decide to take on these poor lost souls stick with the scriptures and keep your cool.