By what it should add I was interested in ideas that would go into the dlc. The introduction of the religion should add a decent change and play style to the game. I am not against personally seeing a dlc come out with the Jewish faith nor saying its a waste of time. If anything I agree with statement that we should be talking about what should be in it if it was made.Isn't that exactly the question that the mod said isn't worth discussing in the post you quoted?
If you really want Jewish faith added to this game your going to have to present aspects that would otherwise not exist in the game. I was interested in hearing ideas from people who have more knowledge on the subject then me. Since as I said outside of 4 random events for Catholics in Europe I cant think of a whole lot reason mostly due to lack of knowing a whole lot of the faith in this time period.