He answers prayers of repentance and blesses acts of repentance. Choosing to believe is an act of repentance from unbelief or unbelief. When an atheist repents of let's say alcoholism, Jesus has mercy and grants them the means to do so. They will never give him due credit, but he made them and he loves them. No one can stop doing anything wrong once they started without his help. Every GOOD thing is possible with God. Therefore analyze your beliefs, attitudes, lifestyle, deeds, whether they be positive or negative. Every positive thing is possible with Jesus Christ, God become man.