Reny is at the church, as is Stefan.
You can spot Stefan by walking to the other end of the gallery. Try to get his attention.
Unlike normal walkthroughs, in Nice Game Hints you can select just the puzzle you want hints for. Here are listed the puzzles for "Level 11 - In the church" in Kapia. The guide you choose only contains information about that puzzle, reducing possible spoilers for other puzzles.