In the OT there are numerious examples of polygamy but in the NT I don't think there are any (apart from Herod whom John the Baptist condemned for taking his brother's wife). Like everything those who don't want to submit to scriptural authority will then find something from scripture and twist it to suit a rebellious and lustful heart. There is a mountain of biblical material in support of monogamy, the purity of marraige whilst marraige as a picture of Christ and the church shows that Christ has one bride: the church (singular)

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Stuart
Elder, Lambeg Baptist, Northern Ireland, UK

In Him the fulness of the Godhead dwells in bodily form and in Him you are complete (Col 2.9-10)

The sacrifice of a broken heart doth please Him but the sacrifice of a broken Christ alone doth satisfy Him (Richard Steele)