Grizabella
Unfortunately, the educational system teaches people that memorization to learn something by rote is the right way to do things. With Tarot, it's just not that way. Having a basis in traditional meanings is fine, as long as you don't adhere to them strictly. Keep in mind "it is, but it isn't."
Heirophant in a relationship reading can be telling you to give due and serious consideration to spiritual and cultural beliefs the two people have, cautioning you to understand how important those are in the success of a marriage. Those run deeper than we believe. Just because one or both have left their traditions, they may not want to ever convert if that becomes an issue and if you don't want to convert, either, it may become a huge issue even if it's not something you could ever foresee being one.
Context is everything in a Tarot reading and you can't ever say "this card means this and that card means that" because they change meanings based on position, relationship to other cards, circumstances that you're reading about, etc.
Heirophant in a relationship reading can be telling you to give due and serious consideration to spiritual and cultural beliefs the two people have, cautioning you to understand how important those are in the success of a marriage. Those run deeper than we believe. Just because one or both have left their traditions, they may not want to ever convert if that becomes an issue and if you don't want to convert, either, it may become a huge issue even if it's not something you could ever foresee being one.
Context is everything in a Tarot reading and you can't ever say "this card means this and that card means that" because they change meanings based on position, relationship to other cards, circumstances that you're reading about, etc.