Pushti Marg Vaishnavism is a Hindu sect founded by Vallabhacharya in the 16th century. It is a devotional form of Hinduism that focuses on the worship of Lord Krishna as the supreme deity. The main beliefs of Pushti Marg Vaishnavism are centered around the concept of "pushti", which means divine grace or nourishment, and the path of "bhakti" or devotion towards Lord Krishna.

One of the core beliefs of Pushti Marg Vaishnavism is the idea of "shuddha advaita", which means pure non-dualism. According to this belief, the individual soul (jivatma) is a part of the supreme soul (Paramatma) and the ultimate goal of life is to attain oneness with the divine. This belief emphasizes the importance of surrendering to the will of Lord Krishna and developing a deep and personal relationship with him.

Another important belief in Pushti Marg Vaishnavism is the concept of "seva", which means selfless service. Followers of this sect believe that serving others is a form of serving Lord Krishna and it helps in purifying the soul. This belief is deeply rooted in the teachings of Lord Krishna in the Bhagavad Gita, where he emphasizes the importance of performing one's duties without any expectation of reward.

Pushti Marg Vaishnavism also places a strong emphasis on the power of "nama japa", which means the repetition of the divine name of Lord Krishna. It is believed that by constantly chanting the name of the Lord, one can purify their mind and soul and attain a state of bliss. This practice is considered to be a form of devotion and is believed to bring one closer to Lord Krishna.

The sect also has a strong belief in the concept of "lila", which means the divine play of Lord Krishna. It is believed that Lord Krishna manifests himself in different forms and performs various leelas (divine acts) for the benefit of his devotees. These leelas are seen as a source of inspiration and devotion for followers of Pushti Marg Vaishnavism.

Pushti Marg Vaishnavism also has a unique belief in the "pushti marga", which means the path of grace. It is believed that through the grace of Lord Krishna, one can attain liberation from the cycle of birth and death. This grace is not dependent on one's actions or deeds, but solely on the love and devotion towards Lord Krishna.

In conclusion, the main beliefs of Pushti Marg Vaishnavism revolve around the idea of surrendering to the divine, developing a deep relationship with Lord Krishna, and serving others. Through these practices, followers of this sect aim to attain oneness with the supreme soul and ultimately, liberation from the cycle of birth and death.