Thank you for writing and we appreciate your feedback regarding this matter, I would like to point out that in the family tree builder software you can write your own custom fact - for example you can write "Religion: Quaker" by double-clicking on the person > Going to the Facts Tab > Choosing New Fact > And instead of choosing from the list - type it down.
However, we won't disregard this feedback and we will take it into account as there are indeed religions that we have missed.
I've run into this several times myself. I can't believe MyHeritage does not include "Lutheran," "Presbyterian," or Episcopal in the drop down menus. I mean, let's face it... those are really fringe religious groups... practically cults.
Isn't it possible to edit the list of Religions which appear in the pull down menu? Commonly, programmers include this kind of information in a .CFG files (or whatever) which can be augmented. Is this "hard-coded" into the program itself in Family Tree Builder. If so, that's really lame coding design.
I've actually found a way for you to input the custom religion as a religion fact. It seems that if you click on the "Edit fact" button and you write the text into the "Description" field instead of choosing one in the religion drop down menu. You should be able to see the religion saved correctly in the facts tab.
I've reported this as a bug for our developers and it should be fixed in the future.