Asking what unites us is a question with no easy answers. Family, friends, shared interests, sports, religion, are examples which come to mind. Unfortunately, those things often divide us. Not sure, ask a Yankee fan about the Red Sox. Religion and faith might unite us. Sadly, they often divide us.
Our firsts bonds begin with our families. As infants, we cling to our parents. Childhood challenges us with new adventures and friendships. Friends for life or friends we leave behind. Life changes as we change. Changes is not inherently good or bad. We outgrow clothes in the same manner we outgrow the beliefs of childhood.
There is no right or wrong way to evolve. Simply a path we each forge based on who we think we are. Hopefully, a tolerant path. Respect for differences and the knowledge that every path is different. None superior to any other.
So, what unites us? Our humaneness. The ability to treat people with kindness, compassion and dignity. Sounds simple enough. Why is it so hard for people to master?