Pusta Krsna: Srila Prabhupada, sometimes in our preaching activities we meet people who claim to be very devout Christians or Muslims but at the same time blaspheme Krsna. Is it possible that such persons can actually be associates of God?
Srila Prabhupada: No. If one is serious about understanding what God is, then he will accept Krsna as the Supreme Lord. Once he knows what God is, he'll understand, "Here is God—Krsna." If he remains in darkness and does not learn what God is, then how will he understand Krsna? He'll understand Krsna as one of us. That's all. But if he knows what God is, then he'll understand about Krsna: "Yes, here is God."
(From "Civilization and Transcendence")