As with most temples, cathedrals and mosques, no expense has been spared. The ostentatious extravagance fulfils the need to demonstrate that it must be true; if it wasn’t who would go to such extremes??
All the wealth is poured into religious buildings.
For me, they are a delight. The best of architecture and craftsmanship can be found in them. They are so aesthetically pleasing if, at times, a little OTT.