“Since one may easily achieve the highest success by chanting the holy name of the Lord, one may ask why there are so many Vedic ritualistic ceremonies and why people are attracted to them. As stated in Bhagavad-gita (15.15), vedais ca sarvair aham eva vedyah: the real purpose of studying the Vedas is to approach the lotus feet of Lord Krishna. Unfortunately, unintelligent people bewildered by the grandeur of Vedic yajnas want to see gorgeous sacrifices performed. They want Vedic mantras chanted and huge amounts of money spent for such ceremonies. Sometimes we have to observe the Vedic ritualistic ceremonies to please such unintelligent men.
Especially in this age of Kali, sankirtana alone is sufficient. If the members of our temples in the different parts of the world simply continue sankirtana before the Deity, especially before Sri Caitanya Mahaprabhu, they will remain perfect. There is no need of any other performances. Nevertheless, to keep oneself clean in habits and mind, Deity worship and other regulative principles are required. Srila Jiva Gosvami says that although sankirtana is sufficient for the perfection of life, the arcana, or worship of the Deity in the temple, must continue in order that the devotees may stay clean and pure. Srila Bhaktisiddhanta Sarasvati Thakura therefore recommended that one follow both processes simultaneously. We strictly follow his principle of performing Deity worship and sankirtana along parallel lines.”
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Sixth Canto, Chapter 03 – Text 25