Romans 3:21-26
Man Falls Short of God because of Our Sins
21 But now apart from the law the righteousness of God has been made known, to which the Law and the Prophets testify. 22 This righteousness is given through faith in Jesus Christ to all who believe. There is no difference between Jew and Gentile, 23 for all have sinned and fall short of the glory of God, 24 and all are justified freely by his grace through the redemption that came by Christ Jesus. 25 God presented Christ as a sacrifice of atonement, through the shedding of his blood—to be received by faith. He did this to demonstrate his righteousness, because in his forbearance he had left the sins committed beforehand unpunished— 26 he did it to demonstrate his righteousness at the present time, so as to be just and the one who justifies those who have faith in Jesus.
Luke 11:47-51
Jesus Says Some of the Prophets Were Killed
47 “Woe to you, because you build tombs for the prophets, and it was your ancestors who killed them. 48 So you testify that you approve of what your ancestors did; they killed the prophets, and you build their tombs. 49 Because of this, God in his wisdom said, ‘I will send them prophets and apostles, some of whom they will kill and others they will persecute.’ 50 Therefore this generation will be held responsible for the blood of all the prophets that has been shed since the beginning of the world, 51 from the blood of Abel to the blood of Zechariah, who was killed between the altar and the sanctuary. Yes, I tell you, this generation will be held responsible for it all.
Luke 16:25-31
God Sent Us Moses and the Prophets
25 “But Abraham replied, ‘Son, remember that in your lifetime you received your good things, while Lazarus received bad things, but now he is comforted here and you are in agony. 26 And besides all this, between us and you a great chasm has been set in place, so that those who want to go from here to you cannot, nor can anyone cross over from there to us.’
27 “He answered, ‘Then I beg you, father, send Lazarus to my family, 28 for I have five brothers. Let him warn them, so that they will not also come to this place of torment.’
29 “Abraham replied, ‘They have Moses and the Prophets; let them listen to them.’
30 “‘No, father Abraham,’ he said, ‘but if someone from the dead goes to them, they will repent.’
31 “He said to him, ‘If they do not listen to Moses and the Prophets, they will not be convinced even if someone rises from the dead.’”
Often I have read where non-believers have trouble believing in God, because of the way that Christians and followers of Jesus acts...It is the believer's actions that others see that sometimes can give a non-believer some negative feedback...However, the only Perfect Man to ever walk the earth was Jesus...And the rest of us have sinned and we all fall short of the glory of God...So we will on days "mess up" and not follow one or more of Jesus' teachings...Followers of Jesus have trouble being like Him, because of our sinful nature...
And God has sent us prophets, wise men, and saints and they have tried very hard to obey and follow the morals of God, and His Will...None of this group ever completely succeeded...The Only One who succeeded completely following the will of God was His Son...