Earlier quoted context omitted.
No one is suggesting marriage means "all relations between two human beings". Only that there are many ways to demonstrate and be committed to a person. The legal recognization by a church or government is one version, but not the key ingredient.
> Only that there are many ways to demonstrate and be committed to a person. And we don't need to use the word marriage for all of them. > The legal recognization by a church or government is one version, but not the key ingredient. The covenant with god has been a key ingredient for centuries.
In some cultures yes, but pair-bonding is a lot older than the idea of god