You are thinking of the Re-organized Church of Jesus Christ

I am not. The RLDS, now known as the Community of Christ, have never sanctioned polygamy. What you're thinking of is the Fundamentalist Church of Jesus Christ of Latter-Day Saints.

who are apostates.

It's interesting that you'd call the Community of Christ apostates, though, given that, during the succession crisis after Joseph Smith's death, many of the notable and high-ranking church members went to the various branches. For example, Emma Smith went with the Community of Christ branch. That being said, other members of the Smith family, such as Lucy Mack Smith, instead went with the James Strang branch because he had a letter from Joseph Smith noting him as the successor. Just kind of surprising that you'd refer to the various Smiths as apostates.

I do not nore [sic] have I ever supported polygamy.

I was talking about how you said marriage was for a man and women. That is to say, more than one woman. But, since you've clarified, I now assume you simply mistyped.

Interesting, though, that you don't support polygamy, given that Orson Pratt said, on October 7, 1869, "This law of monogamy, or the monogamic system, laid the foundation for prostitution and the evils and diseases of the most revolting nature and character under which modern Christendom groans" and Wilford Woodruff said, on May 17, 1888, "We are not going to stop the practice of plural marriage until the coming of the Son of Man."

Those quotes, of course, come from before the United States Supreme Court ruled in Late Corp. of the Church of Jesus Christ of Latter-Day Saints v. United States in May 1890 that the church was dissolved and the government should seize its assets. Shortly thereafter, of course, the church released its 1890 Manifesto. It's the aforementioned FLDS that rejected that manifesto.

I'm just surprised that you think the church leaders were wrong about polygamy and monogamy.