This is a food of thought that humanity developed several religions but only one science? Devotees of different religions follow different customs, rituals, prayers, attributes of gods, etc. Each religion has quite a few sects; these sects are further divided as per the geographical locations. Thus, religious concepts of different people are altogether different.

For example, the devotees of one religion sacrifice animals to appease their gods: whereas, the followers of another one propitiate their gods through the service of those animals. To take another example, the idol worship is core of one religion: however, the other one has imposed a taboo over idol worship. Most devotees explain that the discrepancy among religions is because religions originated in different geographical locations.

Apart from religions, science was also conceived by the scientists of diverse origin; however, they discovered similar principles. There is no existence of Indian science, British science or American science. All over the world, many pioneer scientists discovered their principles, and later others performed several experiments to help establish those. If some principle was found to be incorrect, soon its inventor accepted the truth. This system of experimentation in the quest for truth was rarely followed by the draftsmen of religions. This fundamental mistake facilitated the birth and the continuance of several religions in the world.
There is one concrete reason behind the existence of many religious concepts and only one science on the earth. About one thing or concept, there is only one truth but there can be many lies. Today, humankind has to conceive a global religion with a humane core. All countries have to write a new Bible of international rules and regulations.