Slightly off topic and cool fact: This approach worked pretty well in America in the religious context.
The cornerstone documents of the republic like the US Constitution, the Bill of Rights and the Declaration of Independence make religious mentions (known as Civil Religion) appealing to values common to most faiths but without mentioning any faith concretely. This way anyone can see their own faiths represented. I had to study some of this in uni and found it fascinating.
Interesting follow up: American civil religion - Wikipedia