I think it would be good to really consider what would go into granting such a request. First of all, think of how many religions there are. And not only that, but there are, of course, the major types of religion that most everyone has heard of (such as Christianity, Judaism, etc)... but in addition there are all the little groups that have split off from those - varying denominations - and localized religions that only apply to a (relatively) small area.
If LDW (which, keep in mind, is not a very large game company) were to try to take even a fraction of all of these into consideration, they would be coding and programming for, quite possibly, years to get them all into play. Because honestly, these features aren't just images. They're lines and lines of coding to make the game use those images.
A very complicated request, when you think about it long enough. And if anything (and I mean anything) were left out, LDW stands to have people get mad at them over that too.
It's just simpler and easier to build in the villagers' own little beliefs and traditions and leave it.