Final answer:
The statement is false; unity suggests emotional cohesion, whereas union is a formal joining in marriage, with varied definitions and social recognition.
Step-by-step explanation:
The statement that there is no difference between unity and union when considering marriage is False. In the context of marriage, unity often refers to the emotional and spiritual cohesion between partners, while a union represents the formal and legal joining of the individuals involved. Cultural and legal definitions of marriage can vary greatly, from monogamy, recognized as the union of two adults, which can be of different sexes or the same sex, to polygamy, where more than two spouses are united.
The legal rights and social recognition of marriage have evolved, particularly with the legalization of same-sex marriage in many countries. Moreover, the definition of what constitutes a marriage and a family is a subject of much debate, influenced both by traditional views and progressive perspectives.