Eagledad: I am glad I asked instead of going with my first interpretation!
You are correct in pointing out that morality springs from religion. Some may argue that morals come from "cultural values", but these are largly derived from the sharing of a common religion. However, morals tend to differ from one culture to another for this same reason. What is moral in some parts of the worl would certainly shock those in others. Morals also change with the times. Could you imagine the scandal a woman would create in the Victorian age if she showed up wearing modern fashions?
If morality can be so different over time and distance, who is to say which group is correct? I think the only way to define what is moral from a LEGAL standpoint is anything that does not harm the person or property of a non-consenting other. If people are doing things that don't directly harm anyone who has not consented to the risks, leave them alone and don't judge them.
The person who made this argument best was Peter McWilliams in his book "Ain't nobody's Business If You Do". The entire book is available online at:
http://www.mcwilliams.com/books/aint/toc.htm
Unfortunately, Mr. McWilliams passed away a few years ago after choking to death on his own vomit caused by the nasea he felt while undergoing Chemotherapy. Ironically, he was an avid proponant of medical marijauna, known to abate the nausea.
If you are open-minded, you will probably enjoy the book, even if you choose to disagree with it, as he was a talented writer. Close-minded people won't be able to get past the Author's Note.