I want to make monasteries no longer made obsolete by scientific method, but can't seem to do so. I've tried deleting the "obsolete tech" which works on all other buildings, but monasteries are stubborn. What's the deal?

Maybe you could just move the 10 % science to "ObsoleteSafeChanges" ?

You would not be able to build monasteries after SciMethod, but the ones you already have should keep working...

[Edit] Monasteries are "Special Building" there is a additiona XML file dealing with those - Civ4SpecialBuildings.xml or something like this... Perhaps look there...

[Edit] Monasteries are "Special Building" there is a additiona XML file dealing with those - Civ4SpecialBuildings.xml or something like this... Perhaps look there...
That's right, that's what makes scientific method only obsolete "Monasteries" not "Hindu Monastery and Buddhist Monastery and Jewish Monastery and..."

You need to change the ObsoleteTech in the CIV4SpecialBuildingInfos.xml file.