**Polygamy is not alien to Mormonism.**
The above are your exact quotes, T. The first is an obvious bashing of the Mormon religion...the second is a completely false statement. Those who participate in polygamy are excommunicated from the Mormon religion.
D&C 132:61-62 61 And again, as pertaining to the law of the priesthood-if any man espouse a virgin, and desire to espouse another, and the first give her consent, and if he espouse the second, and they are virgins, and have vowed to no other man, then is he justified; he cannot commit adultery for they are given unto him; for he cannot commit adultery with that that belongeth unto him and to no one else. 62 And if he have ten virgins given unto him by this law, he cannot commit adultery, for they belong to him, and they are given unto him; therefore is he justified.