http://www.religioustolerance.org/reciproc.htmI find it interesting that some concepts are (widely, if not completely) transcultural.
I would find it impossible to crystallize my own beliefs into a single statement of rule. There are many factors that effect how I act towards another person (or anything else for that matter), but if forced to a single word, I would probably use "respect". (Any acquaintance normally gets a certain amount of respect from me to start off with and gains or loses of this measure as our mutual experience develops -- usually spiraling swiftly downward to some level of basic courtesy -- although there are greater depths, including open hostility. -- Of course, I am commonly considered a rather hard case.)
But it is surprising how widely a little "respect" can resonate -- and it is sad (to me) how little it is practiced anymore.
However, I do believe that our society (indeed our whole world) is in a systemic cultural and ethical decline (as I define it -- and one must consider my biases). The shortfall of common courtesy (etc) on this board, for instance, is to me just a symptom of its decline in our society as a whole.
Personally, I am willing to conform to any number of foreign (to me) "norms" (for a short time anyway), and I have gone so far as to console a fundie acquaintance when his wife died, by stating that "She was in a better place", and using similar platitudes. (I even made a special trip to his house to do so.) He's a "nice" guy and does lots of "nice" things for people (including a mutual friend, although the former also gets played for a sucker more than a little), so it was just my way of paying respect -- in a manner that he could relate to.
I wouldn't dream of trying to "convert" him, and they have made only passing attempts to convert me. So on some level the respect is (or was in her case) mutual. Of course he also believes that I am going to hell -- but I don't spend too much time worrying about it.
That sort of sectarian doctrine aside (fear is a great motivator, however, and this "lesson" should be appreciated), you don't have to be a believer to appreciate the value of some "religious" teachings. The "Golden Rule" is an example of such a teaching, although personally I find it a trifle over-simplified. I do, however, recommend it to other people as an ideal worth considering since it is a concept that extends well beyond Christianity.