I agree. Ridiculing Christians for worshipping a zombie, after all their god was a man who was killed then rose from the dead, isn't a productive approach. All that will really do is make Christians feel besieged which is a position they are very comfortable being in, feeling besieged by mean people actually just makes them feel vindicated.

A better approach is to maintain a respectful tone while not giving ground to them. Don't call Jesus a zombie, but do say that you don't think people can rise from the dead after three days. When they say that belief in a god is a necessary foundation for moral and ethical behavior, don't accuse them of only acting good because they're scared of punishment, but instead explain how secular bases for ethics and morality can work.

Skeptics should be able to explain their positions without throwing down with insults. Instead of trying to shame the other guys into silence, explain your own position respectfully. And when that doesn't immediately produce satisfying results, let it be. Some people will only come around after they've had a long time to think about it. Some people will go to the grave believing. That's fine. Becoming impatient and trying to force a satisfying conclusion to the confrontation might make you feel good but it isn't actually doing any net good in the long run.