Are you saying God can't change a heart? Look for instance to Michael Franzese former Capo for the Columbo Crime Family. He is a devout believer in Jesus. Look at the Apostle Paul. He was applauding the death of Christians and threw them in prison gladly. He became a devout believer in Jesus. If God can change these men then Donald Trump can be changed.
Van,
What do you think was the final straw that turned Franzese around? Do you think it was god working through internal guilt of previous actions in his life that finally turned him? What would you think his favorite section of the bible (NT) is, the one that gives him the strength to climb from his past daily? He is a true testament of overcoming past transgressions and knowing the love, I would think.