The worship that was growing in importance in the text between 200 BCE and 200 AC was that of Lord Vishnu.

Explanation:

Lord Vishnu is considered one of the major deities in Hinduism, along with Brahma and Shiva. Vishnu is believed to be the preserver and protector of the universe, and his worship has been an important part of Hinduism for centuries.

During the period between 200 BCE and 200 AC, the worship of Lord Vishnu gained significance and popularity. This period saw the emergence of several religious movements that focused on the worship of Vishnu. Some of the important religious movements that arose during this period include the Bhagavata movement, the Pancharatra movement, and the Vaishnava movement.

The Bhagavata movement was a devotional movement that focused on the worship of Lord Vishnu as the ultimate reality. The movement emphasized the importance of bhakti (devotion) and stressed the need to surrender oneself completely to the will of God.

The Pancharatra movement was another devotional movement that focused on the worship of Lord Vishnu. This movement emphasized the importance of rituals and ceremonies in the worship of God.

The Vaishnava movement was a broader movement that encompassed both the Bhagavata and Pancharatra movements. This movement emphasized the importance of personal devotion and the need to cultivate a loving relationship with God.

During this period, several important works on the worship of Lord Vishnu were also written. The Vishnu Purana, the Bhagavata Purana, and the Narayana Upanishad are some of the important texts that were written during this period.

In conclusion, the worship of Lord Vishnu gained significance and popularity during the period between 200 BCE and 200 AC. This was reflected in the emergence of several religious movements and the composition of important texts on the worship of Vishnu.