Of course, but sacrilege is in the eye of the beholder. It used to be sacrilege to own a Bible not written in Latin and for a layperson to read it directly, now many Christians consider any Bible other than the King James version to be sacrilegious. There's no objectivity or rational thought at work, it's essentially cultural norms and politics.

Many Conservative Christians do believe Santa Claus is an attempt by the "atheist establishment" to remove the Christian identity from the holiday, but that's due to a modern interpretation of Santa Claus as a capitalist icon, and the defensive nature of Christian conservatism. No Christian would likely have questioned the "Christianness" of Santa Claus a century ago, when the status of religion in Western society was unquestioned.