The answer
It is preferable to have both partners belonging to the same culture and denomination, because if it is mixed, there may be some differences in opinion, for example, you want to hold fast your Coptic traditions; he doesn’t understand the need for it, you want to fast; he doesn’t believe in fasting, you want to baptise your children Orthodox; he wants to baptise them in his own church. Therefore it is best to be the same so there can be equality in belief and traditions, and no confusion for the children.
H.G. Bishop Moussa