In the 19th century Charles Bradlaugh, a prominent atheist, challenged a Christian man to debate the validity of the claims of Christianity. The Christian was Hugh Price Hughes, an active soul-winner who worked among the poor in the slums of London. Hughes told Bradlaugh he would agree to the debate on one condition.
Hughes said, "I propose to you that we each bring some concrete evidences of the validity of our beliefs in the form of men and women who have been redeemed from the lives of sin and shame by the influence of our teaching. I will bring 100 such men and women, and I challenge you to do the same."
Hughes then said that if Bradlaugh couldn't bring 100, then he could bring 20. He finally whittled the number down to one. All Bradlaugh had to do was to find one person whose life was improved by atheism, and Hughes—who would bring 100 people improved by Christ—would agree to debate him. Bradlaugh withdrew!