this is a really good question! I don't mind manger scenes at Christmass. They are kinb of cute if not pitiful. I don't mind seeing "God" our our debased coinage. But I cannot imagine myself swearing on a Bible! I look in the damned thing frequently enough to verify items I get, but to swear an oath on it, I cannot imagine myself doing it. However, who knows how compelled i might be....
In any case, what i imagine would be that I would request to swear on my honor as a human being. I would have my lawyer make a big issue of that.