Kali yug, the age of quarrel and hypocrasy is drowning in irreligion and atheistic lifestyles. And so in this age, Krishna was predicted to decent as the Golden Avatar (incarnation), Sri Chaitanya Mahaprabhu and establish the Yuga Dharma of Harinaam Sankirtan - Congregational devotional chanting (prescribed method of liberation according to the current age). Today is Gaura-Purnima which marks the advent of Sri Chaitanya's decent to Earth, in the town of Mayapur, West Bengal - India in 1946.
The Bhakti movement is a Hindu religious movement in which the main spiritual practice is loving devotion towards Shiva or Vishnu. Bhakti movement is also closely related to Sufism of Islam which rose in the same time period and both advocated 'love of God' as the easiest way to attain God.