Atheists should try to debate with, or refute the responses of REAL Christians, such as Biblical scholars and Apologetics websites. They have the answers for EVERYTHING. One of my favorites is www.gotquestions.org . Atheists like to take cheap shots at the arrogant and not very educated Christians, but can they challenge actual THEOLOGIANS and SCHOLARS, and generally knowledgeable Christians?
You act as though this never happens. It happens ALL THE TIME. And, guess what? Never has a single one resulted in someone presenting actual evidence of the existence of God or the veracity of the Bible in its entirety. Isn't that just the weirdest thing?