If your statement above is true, why then the requirement for the temple ordinances, ...the endowment and sealing either on earth or by posthumous temple ordinance by proxy? Why then the requirement that one be married, either on earth or by posthumous temple ordinance by proxy? Why then must a woman be "pulled through the veil" by a man?
Why then, must one "pass the judgement of Joseph Smith to enter the Celestial kingdom?"
No man or woman in this dispensation will ever enter into the celestial kingdom of God without the consent of Joseph Smith. From the day that the Priesthood was taken from the earth to the winding-up scene of all things, every man and woman must have the certificate of Joseph Smith, junior, as a passport to their entrance into the mansion where God and Christ are - I with you and you with me. I cannot go there without his consent. He holds the keys of that kingdom for the last dispensation - the keys to rule in the spirit world." - Journal of Discourses, Vol.7, p.289
"Living according to the gospel of Jesus Christ", really means "Living according to the gospel of Jesus Christ as it is interpreted by the LDS church, does it not?"
Several points:
1. Without the Atonement of Jesus Christ, nothing else matters.
2. Jesus said, "If ye love me, keep my commandments." (John 14:15) The same idea is expressed frequently in the Bible: those who love God keep his commandments (Ex. 20:6; Deut. 5:10, 7:9, 19:9; Josh. 22:5; Dan. 9:4; John 15:10; 1 John 5:2, 3). We believe that those commandments include the making of covenants, such as those involved in the ordinances of baptism, the endowment, and eternal marriage.
3. Not everyone has the same opportunity in life to hear the gospel and accept the covenants. Because God is no respecter of persons (Acts 10:24), he has provided a way that all may receive the gospel and the ordinances. Hence we have the temples and proxy ordinances.
Why then, must one "pass the judgement of Joseph Smith to enter the Celestial kingdom?"
The Apostle Paul wrote that "the saints shall judge the world" and that they would "judge angels" (1 Cor. 6:2, 3) That being the case in Paul's day, I see nothing strange in the idea that Joseph Smith, through whom the ancient Church was restored, will judge those of the latter days. However, he will do so only under the direction of Jesus Christ.
"Living according to the gospel of Jesus Christ", really means "Living according to the gospel of Jesus Christ as it is interpreted by the LDS church, does it not?"
Since I believe that the LDS Church understands the Gospel as well as anyone, I have no problem recommending our interpretation of it.
However, I think perhaps you may be missing an important point. Salvation is not merely a matter of interpreting the gospel, but living it. We will be judged not just by what we know but by how well we lived according to what we know. Those whose interpretation is imperfect may nevertheless be blessed by living the best they know how. As Jesus said, "For unto whomsoever much is given, of him shall be much required" (Luke 12:48).
I believe that God loves all mankind as his children. He desires all to be saved. He will do what he can, consistent with his justice, to save those who will be saved.