Yes, religion is only one. Just like religion... Our definition of religion is dharmaṁ tu sākṣād bhagavat-praṇītam: (SB 6.3.19) "Religion means the laws and the codes given by God." That is religion. Now, God is one. God cannot be two. And what He says, that is also one. So if we accept that one law of God, that is religion. Then there is unity. But if you create your own religion by your imagination, that is another thing. Religion means the laws given by... Just like state law. State law is acceptable by everyone. I have given this instance. The state law is that "Keep to the right" or "left." Everyone accepts. There is no disunity. So if we actually take the words of God, then there is unity. But if we do not take, if we create our own system of religion, that is a different thing.