Is the term “Xmas” part of a war against Christianity?

I suppose that Xmas could be used as part of a campaign against Christianity.  But, historically speaking, it’s definitely not.  Here’s a helpful article about the background of the term:

“The X in Xmas literally means Christ. Here’s the history behind it.”

I might mention that I myself (probably owing to the fact that my undergraduate major was in classical Greek) developed a habit, early on, when I was taking handwritten notes from lectures or readings, of using abbreviations such as χ, χian, and χity for Christ, Christian, and Christianity, respectively; θical and θy for theological and theology; φical and φy for philosophical and philosophy, and so forth.  I didn’t know then that anybody else was doing it.  It simply seemed efficient and obvious.  It certainly wasn’t meant as a negation of Jesus — nor, for that matter, of philosophy or theology.