What is the use or the significance of the ornamental gold cross in Castlevania: Order of Ecclesia?
Solution 1:
As far as I know, the only thing to do is to destroy the lower portion of the wall, as it conceals a hermit ring.
Here's a youtube video of someone breaking the wall:
Solution 2:
Actually, a later quest with the old lady has you sketch the inside of the church, so the cross sseems to act as a marker for that.