Devotion to Quan yin as the bodhisattva of infinite mercy and compassion is widespread in the Buddhist world, and can be dated as far back as the first centuries of the Christian era.

Buddhists live and worship in monasteries. Buddhist temples are places for personal devotion, ancestor worship, mediation, and offerings for the monks and for the Buddha. Individual worship is important to Buddhism.

The plural of devotion is devotions.

The girl's devotion to her job was unbelievable.

You actually spelled it correctly: Devotion.