And why would the spouse want to do so?
I really don't get this idea of going to a place of worship and engaging in their rituals while at the same time not believing in them.
It is an insult to that religion and your own.
'Taint polite.
I wonder how many mixed Protestant/Catholic marriages in 2018 Germany really care about any of it enough to want to do it in the first place. I suspect any that would bother are probably in their 70s. You have to care enough about it to bother to engage in something that both faiths would generally be against in good faith, but still do it anyway?
Freegards