The Christian message is "treat others as you would like to be treated": the idea of people having different wants or needs is out of question. (...)
The humanist message, on the other hand, is: treat others as they want to be treated.
I'm sorry, but you're making a distinction without a difference in the way 99.9% of people understand and mean that quote.
Well, being pedant in religious discussions is kinda my shtick.
What I wanted was to stress the point that the "Christian message" is one of moral absolutes. The humanist message is one of ethical relativism. (Which is not necessarily one of amorality or ethical nihilism, but I know you know that.)