Keep visiting the Church at night or trying to find something to get a clue on Agnes but always kicks me out with empty hands. Is there like an exact moment in a certain day to do this? Or is it just hating on me?
1. You can't get all the clues in the church without first breaking into Callie's house at night. Specifically, the clues you get by exploring the church are blocked until after you break into Callies' house.
2. There are two clues to be found while exploring the church, one in the day, the other at night. They don't trigger every single time you explore, so try a few days in a row until you get the clue (exploring only advances the clock if there's something to be found). Once you've gotten those two clues, there's nothing more to be found by exploring. (Each clue is accompanied by seeing Agnes in a sexy scene).
3. If Agnes is standing at the altar when you enter the church, you cannot explore. She's not there all the time.