Comparative religion, from our point of view, that there cannot be many religion. Cannot be many religion. Religion means . . . we define religion as the law given by God. So we understand from Bhagavad-gītā that God says, Kṛṣṇa says, that man-manā bhava mad-bhaktaḥ, mad-yājī māṁ namaskuru (BG 18.65): "Always think of Me, become My devotee, offer your obeisances unto Me."
So any religion who has no conception of God, how he can think of God? If I think of something, that something must be known to me; otherwise how can I think of it? If I imagine something, that is not God. My imagination of God is . . . God is not a thing to be imagined by me. He is a concrete thing. Therefore according to our philosophy, any so-called religion which has no conception of God, that is not religion; that is simply mental speculation. We accept religion means the law given by God. But if you do not know what is God, what is His law, then where is religion?
Therefore in the Śrīmad-Bhāgavatam it is said that all types of pseudo religion is rejected. You can ask any religious man, "What is your conception of God?" he cannot give any clear conception. So far we are concerned, we can immediately give conception of God—His name, His address, everything. That is the difference. Therefore strictly speaking, we do not accept any system of religion as bona fide. They are all rejected. That is not religion. They do not know what is God. What is that religion? Strictly speaking, that is not religion. But if we speak publicly, they will be angry. So this comparative study of religion, we don't believe in it, because there is no religion.