If Jesus Christ was who He claimed to be, and He did die on a cross at a point of time in history, then, for all history past and all history future it is relevant because that is the very focal point for forgiveness and redemption. ↗
Here's the simplest answer: Within weeks, the disciples proclaimed the resurrection of Jesus Christ, that He had been bodily raised from the dead and appeared to them. ↗
Jesus claimed He had the power to raise himself from the dead and His followers would be raised from the dead. That's a unique claim in the literature of religion. ↗
I hope someday we will be able to proclaim that we have banished hunger in the United States, and that we've been able to bring nutrition and health to the whole world. ↗