The Church of Man, Dead Works, And The 3 Great Sins

Did the murder of the Smith brothers make it possible for the implementation of polygamy? How awful is it to not be fully aware of the way of Salvation of our God? Can we truly receive Christ directly if we don't reject the corrupt institutions of man? When leaders say they can't lead us astray, what damage can be done to their followers? Why would leaders in churches give us milk , little doctrine, & distracting dead works, thus leaving us unredeemed? What qualifies us to be part of the church of the Lamb?