There are some parts of man that seem universal, no matter the culture.
For instance, most cultures I would think carry a similar sense of injustice. An adultery, murder, child rape- those things are considered morally bad.
The capacity or desire for love and acceptance within a person.
Tenderness for babies, whether animals or humans.
I am thinking of using this angle to talk to my father of spiritual things, who has always until now been atheistic. He's only recently shown an interest.
A heart set on love will do no wrong- Confucius
And the work of righteousness shall be peace; and the effect of righteousness quietness and assurance for ever. Isaiah 32:17