I’m trying to express the idea that one need not necessarily be religious to be moral.
“Morality is not the sole domain of religion.” To me, this sounds right, but I think it’s meaning is wrong. Is it instead, “Morality is not in the sole domain of religion.”? Or is it something else?
Thanks
Maybe, “Religion is not the sole domain of morality.”
“Morality is not solely [in] the domain of religion” ?
The first quote is saying to me that religion has other areas of concern besides morality but says nothing about morality itself.
What you came up with makes more sense to me.
I think you have it with this:
Why mess with the domain stuff?
I agree. You could say something like “morality is not necessarily religious.” Unless the word “domain” is part of some sort of extended metaphor you’re using.
I second this one.
I agree. Go with the above.
“Morality is not the sole domain of religion” = religion entails more than morality.
“Morality is not in the sole domain of religion” = religion has on one aspect, and morality isn’t it.
“Religion is not the sole domain of morality” = morality entails more than religion.
“Morality is not solely [in] the domain of religion” = morality can be found outside of religion.
“Morality is not exclusive to religion” = morality can be found outside of religion, but terser and perhaps more readily understandable than the preceding.
As tbdi says, you need “solely” as an adverb, not “sole” as an adjective.
For “sole,” replace “exclusive”. If you say “Morality is not the exclusive domain of religion,” you are saying that religion has other domains in addition to morality. But if you say “morality is not exclusively the domain of religion,” you are saying that morality exists outside of the framework of religion. IOW, in this:
Morality is not the sole domain of religion.
. . . “sole” describes"domain;" the sole domain, or only domain, of religion. (inference: Religion can have other domains besides morality, which actually says nothing about morality.)
But in this:
Morality is not solely the domain of religion.
. . . “solely” describes what morality is, or is not. (Inference: Morality may appear in other domains besides religion, which actually says nothing about religion.)
The second in the intended meaning.
Ah, but are you master of your domain?
Dude, I’m the master of your MOM’S domain! 
“Morality is not solely the domain of religion” is probably what I was thinking of trying to say (it kind of flows off the tongue better IMO), but “morality is not exclusive to religion” is what I’m gonna go with. Thanks!
Definitely not. In mathematical terms, ‘A implies B’ is not the same as ‘B implies A’. Your re-writing should follow the relationship, ‘A implies B’ is the same as ‘Not B implies Not A’, or ‘Lack of religion does not mean a lack of morality’.
If you aren’t tied to using “sole” and “domain” then…
religion has no monopoly on morality
or, more appropriately, “mythology has no monopoly on morality”
It is NOT more appropriate to equate religion with mythology, unless you are certain your audience will share your opinons or biases.
“Appropriately” was actually only meant as a reference to the similarity of the words in use but it seems I struck a nerve. I picked the word only after checking 37 Synonyms & Antonyms for RELIGION | Thesaurus.com to look for possible options. I had no intention of starting another atheist vs theist trainwreck.