All endings are achieved with different combinations of answers to Shanice (the nun) and Ecclesiasticalot FF (Priestbot). Simply try one that you hadn't already and you should eventually get all of them
A small spoiler: You get the 5th one by choosing the second option first time you talk with Shanice (being realistic with her instead of cheering her up). It's the fastest and easiest one to get, hence why I believe you won't mind that I've told you how to get this one. Just remember to go back to the church one more time next day. I can tell you the other ones if you want and nobody tells you before that