Buddhists especially ought to know that preserving and paying homage to old dried bones is ridiculous. It’s contrary to everything the Buddha taught. But, it’s their funeral (pun intended).
The concept of the incorrupt body of dead saints, monks, or holy people is common to both Buddhist and Christian traditions. Christians don’t worship such people, nor do Buddhists.
Its simply an inexplicable sign of their holiness, which is worthy of respect.