The central doctrine of Christianity states that Jesus will return in his Father's glory with his angels to judge the living and the dead, gathering up his elect to take them to spend an eternity in heaven with him, while casting the unbelievers into eternal hellfire. However, what many Christians do not realize is that when reading the Bible, we find that Jesus himself actually gave a very specific timeframe of when this apocalyptic event was supposed to occur. And, as it turns out, this timeframe has long expired. Jesus predicted that he would return, and that the apocalypse and final judgment, would occur within the lifetimes of his disciples, certainly no later than 100 AD.
One example Scripture where Jesus mentions this is found in Mark 13:9-30, where (referring to the final judgment), Jesus states:
“You must be on your guard. You will be handed over to the local councils and flogged in the synagogues. On account of me you will stand before governors and kings as witnesses to them. And the gospel must first be preached to all nations. Whenever you are arrested and brought to trial, do not worry beforehand about what to say. Just say whatever is given you at the time, for it is not you speaking, but the Holy Spirit. “Brother will betray brother to death, and a father his child. Children will rebel against their parents and have them put to death. Everyone will hate you because of me, but the one who stands firm to the end will be saved.
“When you see ‘the abomination that causes desolation’ standing where it does not belong—let the reader understand—then let those who are in Judea flee to the mountains. Let no one on the housetop go down or enter the house to take anything out. Let no one in the field go back to get their cloak. How dreadful it will be in those days for pregnant women and nursing mothers! Pray that this will not take place in winter, because those will be days of distress unequaled from the beginning, when God created the world, until now—and never to be equaled again.
“If the Lord had not cut short those days, no one would survive. But for the sake of the elect, whom he has chosen, he has shortened them. At that time if anyone says to you, ‘Look, here is the Messiah!’ or, ‘Look, there he is!’ do not believe it. For false messiahs and false prophets will appear and perform signs and wonders to deceive, if possible, even the elect. So be on your guard; I have told you everything ahead of time.
“But in those days, following that distress,
“‘the sun will be darkened,
and the moon will not give its light;
the stars will fall from the sky,
and the heavenly bodies will be shaken.’
“At that time people will see the Son of Man coming in clouds with great power and glory. And he will send his angels and gather his elect from the four winds, from the ends of the earth to the ends of the heavens.
“Now learn this lesson from the fig tree: As soon as its twigs get tender and its leaves come out, you know that summer is near. Even so, when you see these things happening, you know that it is near, right at the door. Truly I tell you, this generation will certainly not pass away until all these things have happened.
A common explanation that apologists and pastors give to explain away this passage is that "this generation" referred to in verse 30 is not actually referring to the generation alive at Jesus' time, but instead is referring to a future generation, or perhaps defining "generation" to mean something different than its usual sense. But when we examine other passages in the Bible where Jesus makes this same prophecy, we see that clearly, this is not the case. Jesus is in fact referring to the literal generation alive at the time he was. Let's take a look at another instance where Jesus makes this same prediction of his return, but even more explicitly states that it will be within his disciples' lifetimes: Matthew 10:17-23. Notice that the language used in Matthew 10:17-22 EXACTLY mirrors the language used in Mark 13:9-13, which is very clearly a chapter about end times, so there is no ambiguity about what Jesus is referring to here. He is very clearly returning to his Second Coming and the subsequent end of the world. Mark 10:17-23 states:
e on your guard; you will be handed over to the local councils and be flogged in the synagogues. On my account you will be brought before governors and kings as witnesses to them and to the Gentiles. But when they arrest you, do not worry about what to say or how to say it. At that time you will be given what to say, for it will not be you speaking, but the Spirit of your Father speaking through you.
“Brother will betray brother to death, and a father his child; children will rebel against their parents and have them put to death. You will be hated by everyone because of me, but the one who stands firm to the end will be saved. When you are persecuted in one place, flee to another. Truly I tell you, you will not finish going through the towns of Israel before the Son of Man comes.
Here we can see very clearly that "this generation" referred to in Mark 13 is in fact the generation alive at Jesus' time, and that Jesus explicitly and unambiguously predicted that he would return within the first century A.D.
This failed prophecy is also found in Matthew 16:27-28, in which Jesus states:
For the Son of Man is going to come in his Father’s glory with his angels, and then he will reward each person according to what they have done.
“Truly I tell you, some who are standing here will not taste death before they see the Son of Man coming in his kingdom.”
So, clearly, the second coming of Christ and subsequent Apocalypse that was supposed to occur in the first century never happened, and Jesus was wrong. Yet, more than 2000 years later, billions of Christians around the world still earnestly believe that it will occur in the future, and are not aware that this prophecy already failed. The truth is, there is no reason to expect that this second coming will ever happen, and is anything more than a fairy tale. If Jesus was wrong about something as key and central to Christianity as this, there is no reason to trust that Jesus was right about anything else he said, and no reason to believe that the Christian god exists outside the imaginations of those who believe in him.