The phrase "share a common humanity" is correct and usable in written English.
You can use this phrase to express that people, regardless of differences like nationality, background, culture, prejudice, etc., are still connected by a shared set of human values and experiences. For example: We must remember that despite our differences, we still share a common humanity that should be respected.
We vary greatly as individuals and by culture, but we share a common humanity that allows every human being to potentially communicate with and enter into a moral relationship with every other human being on the planet.
At the end of the day, we are all humans and we share a common humanity and Earth citizenship with all people around the world regardless of their beliefs.
But it's also true because we share a common humanity and a common decency.
Leadership strong enough to recognize the nations share common interests, and people share a common humanity.
We share a common humanity and that is sufficient for us to feel rage and pain.
Since we share a common humanity, even in this age people will understand the term, though it finds few illustrations.
Travel has set you free from the ethnocentric delusion that your culture alone is the ultimate standard, and connects you to a larger, more humane and inclusive understanding of the world, in which everyone shares a common humanity.
Nowhere in the world, perhaps, is better than the British Museum at forcing on its visitors a recognition of how every culture in every period has shared a common humanity.
Proulx is drawn to Wyoming, you feel, because it reveals people as essentially small against the vast open spaces, sharing a common humanity of isolation and vulnerability, while at the same time exaggerating their quirks and individual oddities.
Despite or perhaps because of Bin's insistence that he and the customer shared a common humanity, the customer became violent.
The philosopher Avishai Margalit privileges an ethics "that tells us how we should regulate our thick relations" with family, friends, and others who are close to us, over a "morality" that concerns our "thin relations," with those with whom we share only a common humanity.
