What did the bhakti and Sufi …

The impact of the Sufi and the Bhakti movements on the Indian society were:

The Bhakti and Sufi movements showed to the people that the existence of God could be experienced under the guidance of a guru. Priests or the ulemas are not required to feel the presence of God. Thus many people began to question the authority and domination of their religion by the religious authorities.
The Bhakti saints crticised the existence of rituals in the Indian society.
Both the Sufi and the Bhakti movements emphasized on the feeling of universal brotherhood and religious tolerance. As a result, an environment of mutual love and respect was created among different sections of society.
Since the Bhakti and the Sufi saints preached their teachings in the local language. This led to the development of the local and the vernacular languages.