It is derived from divine revelation to Moses and an oral tradition that is passed down from Adam. That it was not written first isn’t proof it isn’t the first.
Wasn’t it? Do you know the various cultural religions? They may not be monotheistic all, but I notice a pattern. In the Americas they have the Great Spirit, the Yoruba in Africa have one God but who is separated from humanity so created various gods to bring up their prayers, in China they had Shangdi, who similarly was too high and did similarly; in India they had their one God who was utterly unknowable and hence became various other gods, through which this God expresses him/her/itself.
I hope you see how similar this is to the true religion. The Bible might imply that humanity believed in God but went away, and then Abraham found Him again, but forget not Melchizedek.
Idk. But, the Church teaches the Muslims adore God as well.
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