Well Humanity or humanitarism is the idea of treating each other kindly and fairly.
Culture is a number of thing's ranging from loacl or regional lifestyle to religon or politically veiws.
If we were to agree to disagree and stop fighting over who's religion or denomination was right and prolcaim world peace those to would finally be conected.
The conection is that most people secretly wish that the two could finally coexist culure and humanity