Earlier quoted context omitted.
I'm Muslim too and I always find it interesting to see how various non-Christian theists observe Christmas. Obviously we don't "celebrate" but I personally don't see anything wrong with partaking in the secular parts of Christmas (and let's be real, in the west, it's pretty much all secular). My parents felt otherwise when I was growing up, so my siblings and I weren't allowed to do anything Christmas related, but no…
I will argue that in the US Christmas is in part a secular holiday - given its sorta pagan origins that makes total sense to me. It's a solstice feast basically.
For example, Christmas trees date back no later than the middle ages: