Is it viable to use the law of religion under a secular court? Catholic priests aren't allowed to marry (which is under their religious law), and thus removing his right to marry, for example. So, if the priest were to file a case stating that he was not allowed to marry, is it sensible? Of course, legal investigation is possible, but it will be proven that they're not really allowed to marry. Can the Catholic church use its laws on these kind of cases? Sorry, I couldn't think of a better example. Thank you in advance!