Vedic religion means varnasrama-dharma. Krsna says, God says, catur-varnyam maya srstam [Bg. 4.13]. So that is obligatory. Just like law is obligatory. You cannot say that "I don't take this law." No. You have to take it if you want to have a happy [society].

Srila Prabhupada — Answers to a Questionnaire from Bhavan's Journal; New Vrndavana, 28 June 1976