First, let's get the 'previous' point out of the way. It's not regional, it's absolutely in common usage. The link is missing from the definition provided below but it is in fact from the OED online.
So, the thinly veiled sneering at 'regional' is not necessary. It's about having a strong grasp of language. Some might say it's about education, but that would be just as sneery as saying its regional.
'What wedding ceremony lasts less than an hour': well, the vast majority of them! Some people choose to add a mass or religious service to their wedding ceremony, but it's usually not part of the ceremony. An Anglican or catholic ceremony,for example, takes only a few minute. It's the 'I do' bit. The rest,of people do it, is a mass. But it's not necessary to the marriage ceremony.
A normal non religious ceremony takes a couple of minutes, usually strung out with some music or poetry or readings etc.
And to the substantive point: if someone believes in a god or gods and you don't, I can't see how there can be mutual respect, even without the difficulties that would arise in many relationships. Could you really love someone whose beliefs are so at odds with yours?