They steadfastly cling to the belief that instead of dying, the will live forever with Jesus and friends.
Facts and data become irrelevant.
Like the fact that the rule book of this cobbled together, cooked up religion of the Bronze Age was decided by a committee of politicians a couple of hundred years after Jesus was romping around the Middle East.
Their Mummies and Daddies told them about Santa and told them about Jesus. Children will believe anything.
So why did they stop believing in Santa but still believe in Jesus?