Child abuse is not an official sanctioned thing in Mormonism. And they have officially ended the practice of polygamy (yes there was some coercion on the part of the US govt)

The other three were pretty much traits of every major traditional religion at its founding.

The founder of mormonism married a child and given that mormon doctrine is just whatever he said definitionaly it's an official sanctioned thing.

Some coercion? It was entirely external pressure. Some of the mormons haven't even stopped polygamy today.