Hmmm you can but it won't be that easy. Open save file, It is in the "Assets" folder and then do the following.
First step - Change two variables "priestBotPoints" and "nunPoints" in the save file to 0.
Second - in the flags variable remove all flags with the word "church" followed by something. Leave the flag "church" though.
Also remember that there are multiple save slots, so you might haver to find the right one in the file.
After this you should be able to try again.