People often don’t believe there is a God because bad things happen to good people. I’ve heard it asked that if God is good, why are things like genocide or murder so common? To start, man is sinful by nature. We are sinners, so bad things happen in the world. Jesus did not promise us utopia. Jesus does promise:
And you will hear of wars and rumors of wars. See that you are not alarmed, for this must take place, but the end is not yet. For nation will rise against nation, and kingdom against kingdom, and there will be famines and earthquakes in various places. All these are but the beginning of the birth pains.
Then they will deliver you up to tribulation and put you to death, and you will be hated by all nations for my name’s sake. And then many will fall away and betray one another and hate one another. And many false prophets will arise and lead many astray. And because lawlessness will be increased, the love of many will grow cold. But the one who endures to the end will be saved.
Jesus did die to forgive our sins. Because we still commit them. Sin is not erased from the world. Bad things will still happen until He comes again.