What's the secular reading of "You shall have no other gods before me" ? What?

I can understand that Christmas has mutated into a family reunion, a time for gathering with loved ones etc, even Santa Claus, name and all, has turned into the figure that brings presents, but even if I can understand "You shall not murder" as a secular rule, the ten commandments as a whole are really hard to take as such no?

They are common to all Abrahamic religions, in spirit if not word-for-word. Hinduism also has its 5 principles and 10 disciplines which are broadly similar.

Perhaps "secular" is not the best description, but for anyone faithful to any of the major religions, these are going to be broadly shared principles, in addition to being the basis for most of our laws and social norms regarding individual behavior (don't kill, don't steal, etc.)

It's kind of like having "In God We Trust" printed on our currency. It's not a specific (i.e. Christian) God, at least that is the justification, and it's not seen as "respecting an establishment of religion" in the Constitutional sense.