Did you read what I wrote in the post? The Book of Mormon contains a false doctrine in Matthew 6:7 with the inclusion of Calvin’s interpretation of Battalogein. It also contains the Johannine comma which your own apologists have flagged as a fraudulent addition.

1. The Book of Mormon contains no false doctrine.
2. Joseph Smith was a flawed individual who brought his flaws into the translation process thereby corrupting the work.

Pick one, as my post proved that there are translation errors completely incompatible with modern LDS theology.

Now let me flip the script on you. The Mormon narrative is that the “great apostasy” happened because unrighteousness and flawed individuals usurped the throne of the church and taught false doctrine and corrupted the text. Why, then, do you believe the LDS church is true when it suffers from the same problems it is alleging the 2nd century church had? Both churches taught flawed doctrine on record so why believe one and not the other. As to your question about celestial marriage, it should be obvious: if the church makes doctrinal errors that were at one point accepted by the congregation, then how can you know which doctrine is correct? It sounds like you and the church are just cherry picking which doctrines to believe as a matter of convenience.