Challenge: You're a Christian? Oho. So give me a convincing argument as to why God...?
Response A: I'll be happy to respond, but please answer mine first. How do you convince someone to accept a true, accurate and sufficient answer that he is unwilling to accept?
Response B: I'll be happy to, but please answer mine first. How does one persuade an arrogant blowhard who is unwilling to acknowledge his own biases, presuppositions and errors, and who is unwilling to answer even this question directly, to accept even a completely true and irrefutable answer that he refuses to accept?