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.
A great many people want to bring their faith, their works, their good deeds to Him for salvation. Bring your sins, and He will bear them away into the wilderness of forgetfulness, and you will never see them again.
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.