To every Christian : Do not object

[pandora]

You are again harking back to the Old Testament for your examples. This is because it is clear in the New Testament, which is Gods new covenant with mankind that polygamy is against what God ordained. Polygamy in the Bible was never allowed by Gods law but rather an action of men going against Gods law...for their own purposes. It is shown in the Bible as a lesson how not to behave as such as Lamech, David, Solomon and others who were polygamous their lives did not turn out well, it is said that Solomons heart was hardened against God by his polygamous actions.

The clearest verse comes from Jesus in His teaching regarding plural marriage must be Matthew 19 8-9 which is on divorce

Jesus replied, "Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning. 9 I tell you that anyone who divorces his wife, except for marital unfaithfulness, and marries another woman commits adultery." (Matt 19.8-9)

The key thing to note here is that this argument fails if polygamy is acceptable. Jesus' point is that improper divorce does not nullify a marriage, and if the first marriage still stands, then a "second" marriage is adultery--and NOT simply 'polygamy'! This is very clear.

So you should not seek to justify polygamy in the Quran by passages from the Bible. The Old Testament practices you use in your justifications were already superseded by the teachings of Christ. Polygamy is not a decree from God..or ever has been. But a practice of men born from circumstances, traditions, tribal allegiances and mans lusts.