Artificially you have opened this United Nation, but your conception is, "I am Indian," "I am American," "I am Hindu," "I am Muslim." So how it can be, there can be unity? It is not possible. That is not brahma-bhūtaḥ stage. That is prakṛta stage, identifying with this body. So long you identify with this body when you are in the material conception of life, there is no question of spiritual understanding, there is no question of joyfulness, there is no question of freedom from lamentation and hankering and there is no question of equality. It is all false show.
So therefore here is the explanation, sa vai puṁsāṁ paro dharmaḥ. Paro dharmaḥ. Here it does not say that "Hindu religion is the best" or "Christian religion is the best" or "Muhammadan religion is the best." No. That religion is best which teaches the follower how to love God. Sa vai puṁsāṁ paro dharma yato bhaktir adhokṣaje (SB 1.2.6). If one is lover of God, then he is lover of everyone because he knows everyone is part and parcel of God. If you love your father, then you love your brother. But if you do not know who is your father, then how you can say "universal brotherhood"? This is all hypocrisy. You first of all know. You must first of all know what you are, what is God, what is your relationship with God. And when it is perfectly understood, then there is the possibility of samaḥ sarveṣu bhūteṣu, paṇḍitāḥ sama-darśinaḥ (BG 5.18).