There’s a reason that God commands all men everywhere to repent. It’s “…because He has appointed a Day on which He will judge the world in righteousness by the Man Whom He has ordained. He has given assurance of this to all by raising Him from the dead” (Acts 17:31, italics added). We can have assurance that the Day of Judgment will take place and that Jesus will judge the earth—because of the resurrection. So should we then try and convince an unbelieving world of the resurrection? Many do, by pointing to the 500 witnesses who saw Him after He was raised, to the disciple who actually touched His side, to those who were willing to be martyrs for Christ, etc. But is Islam true because of its martyrs who give up their lives for their faith? What if someone doesn’t believe the Bible when it speaks of the 500 witnesses, etc.