Why iskcon is taking bhagavatam as authentic other then Vishnu Purana and Shiva Purana and skanda Purana ?
Do iskcon consider other then bhagavatam all puranas are interpolated
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Because Srimad Bhagvatam itself Declared it the Greatest and same thing is confirmed in Garud Puran, Padma Puran, Skanda Puran, Matsya Puran etc. This is also confirmed by Acharyas of all 4 Vaishnav Sampradayas.
Srimad Bhagvatam is considered Greatest in all 4 Vaishnav Sampradayas and their Shakhas be if Madhva Sampradaya, Gaudiya Sampradaya, Vadakalai Sri Vaishnavas, Thenkalai Sri Vaishnava, Ramanandi Vaishnavas, Nimbarkacharya Sampradaya, Vallabhacharya Sampradaya and also it is the Opinion of Sripad Sridhar Swami.
We refer to other Puranas also but the Central emphasis is on Bhagvatam and anything which Contradicts Bhagvatam should be either Reconsiled or if un reconsilable then it should be understood to be for Bewilderment and not the ultimate Conclusion.
Coming to Interpolation, it is a fact that many Scriptures have been Interpolated over time so we don't have to Focus on that. Generally it is observed the Bhagvatam, Narad Puran, Matsya Puran, Vishnu Puran did not suffer Interpolation, rest may have some but that is not the Concern, we accept whatever is in line with Bhagvatam