Can we have celestial glory without the LDS church? If not that means Joseph Smith trumps Christ and Christ died and resurrected in vain.
The LDS DO in fact place their own worthiness (required) and works and Joseph Smith over Jesus Christ.
Salvation is through Christ who has established His church administer the principles and ordinances of salvation. In New Testament times he founded His church and called the Apostles to administer the gospel of salvation.
Latter-day Saints believe that in our day Joseph Smith was called by Jesus Christ as prophet to restore His church to the earth and by him revealed the principles of salvation.
We believe that only through Christ can sins be forgiven, and death can be conquered.