I was raised Atheist and we celebrated Christmas and Easter because it was part of my parent's heritage and the culture they were raised in. My DH is a recovering Catholic and we chose to continue
We do the Easter Bunny and hide eggs, the tradition predates Christianity by about 2000 years.
I was not raised in a religion (knew I was an Atheist at around 11) but I've always celebrated the holidays.
My neighbor feels that it is more of a vampire myth than a zombie myth since there was "blood" drinking at the Last Supper.