In typical Hollywood style, The Mentalist, that dropped anti-Christian hints throughout, ends in what has been made to appear an extant Catholic chapel. They have the candles lit -- just a little clue, the candles are lit only during the Mass and services such as funerals and weddings, and the Easter candle (the large one next to the front pew), if legit, is very holy -- and the supposedly worst criminal in California history is fondling the Altar (at least they placed an arrangement of flowers in front of the Tabernacle in this scene, unlike the one with Jane alone).
I have to believe that this is a chapel that is no longer dedicated Catholic and is simply staged. The building itself is beautiful and is probably the epitome of what everyone thinks of as a Catholic chapel, even one that, perhaps has been there since the Franciscans settled the area. The fact that the ptb even thought of doing this scene there indicates an imbedded antipathy toward the Catholic Church, like they were having a little laugh behind what should have been
a very dramatic event in this series and what turned out to be a joke itself.