I have no idea if this is even the right forum for a question, but it's my best guess at the proper one. Anyways, I was wondering if it's possible to restrict certain techs if another one has been discovered. For example, I had considered using alternate versions of the same religion in a planned mod. If one were to research the 'Good' side of the religion is it possible to then remove the ability to research the 'Bad' side of the religion?

Technically I think this should just go in the main forums. It definatly would get more attention there.

But anyway, to your question.
I would think that the easiest way to do this would be to have the "good" religion techs obsolete the "bad" ones. I do not have access to my main computer right now so I can't really tell you how to do it, but I am 95% sure it can be done. The only downside is that once you chose one, it would be a set thing, no switching later on.

Makes sense, thanks. I had forgotten simple obsoletion.

BTW, any chance that OoTP avatar refers to Out of the Park baseball?