Saul, you are way off the mark here. No one is required by any rule of civility to change how they sign off unless they are doing something that is clearly intended to offend. In other words, if one signed off anti-semitic, racist, or openly hostile comments, that would clearly be intended to offend all people of conscience. "Be Blessed" could hardly be considered offensive in any terms, and those that take umbrage to it are likely folks that are so strident in their beliefs that they would take umbrage at any reference that wasn't strictly in line with their views.

Watching for intent is good sauce here. It seems clear that the intent of GS is to wish well to all. And the phrase used is very neutral. I would probably be offended if s/he knuckled under to this.

Statements made to reflect one's beliefs, that are not done in an intentionally offensive way, are not only within the bounds of civility, but are the ultimate expressions of civility. While I am not a Jew, or a Moslem, I would take a blessing from these or any group, in the spirit with which it was intended.

All the best,

Mick