Total depravity is the doctrine that humans are corrupt by nature and will inevitably sin and fail to obey God. It is considered to be true by many Protestant denominations, particularly those having Calvinist beliefs.
A will that is predisposed to choose evil is not free, which contradicts a core Christian concept of free will.
Problem of evil
Why do good things happen to bad people
"So the real question is, who [sic] do good things happen to bad people? Why does God send the rain on the just and the unjust? Why does He let blasphemers live?"
Jesus was human
"For this reason he [Jesus] had to be made like them, fully human in every way"