Why want just one muslim out of 6,ooo,ooo refute ali sina? that mohammad was a rapist, and slave trader?

ali sina says that if you would take the time and show him wrong that mohammad was not a rapiest,a pedophile, in, m murderer, ruthless torturer, a terrorist and a lot more. he would give you and the scholar that showed him wrong 100,000 dollars. this offer is 6 years old but no muslim will take the time to prove him wrong. why? i think i should get at least 25% for showing this to muslims.