One God of the Bible But Believers Don't Unite in One Religion

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There is only one bible, one reference and the same God they call upon. Why do you think religions like Born Again, Catholic, Jehovah's Witness, Baptist, Ang Dating Daan, Iglesia ni Cristo, El Shaddai, and so on, don't merge as one religion. They all worship same God in the bible. Would it matter to God what religion you belong even if you are a good person? Is it subjective?