I am confused about what this means!
A prayer should be done with hearts and bodies, lips movement doesn't really mean anything if there is no belief and no convection. How can I do Christian's prayer for example if I don't belief in the concept?
Still it is not a book of History
however, The Quran points to some scientific and historical information. usually, when We point at something, We don't give details
so, what about it! Muslims Men can marry 4 wives, it is not a must but it is a permission. The point you seem to forget Mahasen is, In Islam there is limitation of 4, do you have limitation in the Bible?