Premise of this question: first of all, I'm basing this question on my common sense understanding that moral responsibility and judgement presuppose that human beings have the capacity to make free choices in the libertarian sense, meaning that every time a human being is faced with the options A = sinning and B = not sinning, he or she is morally responsible for choosing A instead of B because they could perfectly have chosen otherwise. In other words, the counterfactual situation in which the person chooses B instead of A was perfectly possible in principle, as there was nothing forcing the person to choose A, yet they still freely chose A, and so they are morally responsible for it. This runs contrary to the deterministic view, in which counterfactual situations are impossible, meaning that a person couldn't have chosen otherwise. If a person chooses A, it means that it was impossible for them to have chosen B, and viceversa. In other words, a human being is not more morally responsible for choosing A than a rock is morally responsible for "choosing" to fall downhill or a light bulb is morally responsible for "choosing" to produce light when its switch is turned on.
1) According to Christians who believe in libertarian free will, do ALL human beings have a genuine chance to make the right choice every single time? In other words, do ALL human beings, in principle, have the possibility to choose to live a perfect, sinless life?
1.1) If your answer is YES: then how come pretty much no one chooses to do that?
1.2) If your answer is NO: then doesn't this contradict the free will assumption? If people are free not to sin, shouldn't this imply that people are free to choose to never sin (i.e. to choose the right option every single time)? Is there anything forcing people to sin at least once? If so, what is it, and how can someone be held responsible for being forced to do something? Aren't rocks forced by gravity to fall downhill? Should we hold rocks morally responsible too?