The resurrection is not just proof of something. It is the beginning of something. It is the firstfruits, the first sheaf lifted before HaShem, guaranteeing that the full harvest is coming. It is the launch of new creation. It is the promise that every grave is temporary. The appointed time of Yom HaBikkurim does not say "look what happened." It says "look what is coming."

But you cannot know that if you have never been taught the appointed time. And most believers have not been taught it. They were given a holiday. They were not given the harvest.