Then he's failed, hasn't he? 'Some day' isn't good enough for those suffering right now; so much for love.
It sounds like you're trying to make a back door argument that either God doesn't exist, or that he isn't a God of love. In that case you're not just condemning Jesus for not solving all human problems 2000 years ago, but by extension condemning God for allowing Adam and Eve to fall in the first place, bringing sin and suffering into the world. But I don't buy it. How sin began and why God doesn't intervene to fix everything are complex questions. But is the only possible answer then that God has forsaken us, doesn't keep his promises, and doesn't love us? That's a conclusion based in resentment and superficial understanding.
I agree that Jesus did fail in what he wanted to do, but so what? It doesn't reflect on him personally. He wanted to create the Kingdom of Heaven and eliminate all sin 2000 years ago, while most Christians see those ultimate promises are meant for his second coming. When God promises something it will be fulfilled, but
when is conditional on the response of people. Jesus initially told us the best case scenario, the accomplishment of which depended on the Jewish people believing in him. IMO,
if Jesus had been accepted, then he could have brought full salvation, including the elimination of original sin, 2000 years ago. But when Jesus saw that the rejection of his work was too strong, he accepted the secondary course-that of going to the cross.
Spiritual salvation through belief in Jesus is real, but it falls short of the full salvation that now has to wait for his return. Let me make it clear-I believe in final universal salvation. So there will be no unfortunate casualities of the history of sin and suffering, whose dead bodies fall by the wayside, so that only a select few receive the final perfection and salvation of the kingdom.