The 2nd Article of Faith, in its entirety, says:
We believe that through the Atonement of Christ, all mankind may be saved, by obedience to the laws and ordinances of the Gospel.
This Article of Faith says nothing about the LDS Church (other than the fact that the "ordinances of the Gospel" are included within it), and it says nothing about believing everything someone else believes, and it says nothing about cultural expectations, and it says nothing about general rules and instructions, etc. It only talks about "the laws and ordinances of the Gospel".
I think that's important to consider.