I've stopped debating for a myriad of reasons, but the biggest one is that so many people refuse to see or accept the flaws you point out in their claims. Then they just continue to push those same claims while still refusing to acknowledge the holes you've put in them. Debates can't work if one side refuses to let anything from the other side sink in, which pretty much sums up what it's like to debate a Christian.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell