Our religion speaks of the creator of the universe, Krishna, descending upon the world in a time of great crisis. This being would be spiritually pure and wipe all evil from the world, ushering in an age of peace.
Krishna would take the form of an avatar, the manifestation of god made flesh. This human incarnation would rule the planet as a living deity, leading the human race into the golden age of humanity. However, the prophecy surrounding God was not entirely correct. Krishna arrived as the myths states, but he appeared as seven avatars instead of one. These partial avatars, known as "arishnas" represent Krishna in different forms, but share the same underlying consciousness.
These arishnas each placed their roots down in the different continents: North and South America, Eurasia, Antarctica, Australia. There, they set up their own religions and priesthoods, with the people of that continent worshipping them as its leader. Our unified world religion became seven different faiths, each worshipping a different living arishna instead of the one god.
As avatars are worshipped, the original being of Krishna gains power from all avatars being prayed to. In a fictionalized version of our world, there are three religions that worship the same god, but in different ways. They are known as Judaism, Christianity, and Islam, with them being 1.0, 2.0, and 3.0 respectively. This is because they were formed in different time periods by different people, which explains the vast differences between them. As there are no living manifestations of God, everyone is worshipping it based on their own subjective experience. In the real world however, there are living deities walking the earth who are in direct contact with people.
What would God benefit from having multiple religions based on him rather than establishing one unifying creed?