In the past many religions and civilizations condoned polygamous marriages.
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While polygamy is a necessary tenet of Mormonism, the “first principle” it has never been part of Christianity..
Polygamy is not Biblical..
God has never told anyone to commit polygamy..
ONLY if you wanna keep the smell of BRIMSTONE outta yer clothes!
"Now if any of you will deny the plurality of wives, and continue to do so, I promise that you will be damned;
and I will go still further and say, take this revelation, or any other revelation that the Lord has given,
and deny it in your feelings, and I promise that you will be damned.
Brigham Young - JoD 3:266 (July 14, 1855)